American Airlines flight AA 6603: Multiple routes

FLIGHT SCHEDULE
Direct Codeshare Flights:
Wed 06:45 Rome Leonardo da Vinci Fiumicino (FCO) 3 08:35 London Heathrow (LHR) 5 AA 6603 Non-stop Airbus A320 (320) 2:50 Effective 2026-04-01 through 2026-07-15 Codeshare flight, operated by British Airways.(BA 565)
Wed 06:45 Rome Leonardo da Vinci Fiumicino (FCO) 3 08:35 London Heathrow (LHR) 5 AA 6603 Non-stop Airbus A321 (321) 2:50 Operates only on 2026-07-22 Codeshare flight, operated by British Airways.(BA 565)
Wed 06:45 Rome Leonardo da Vinci Fiumicino (FCO) 3 08:35 London Heathrow (LHR) 5 AA 6603 Non-stop Airbus A320 (320) 2:50 Effective 2026-07-29 through 2026-08-12 Codeshare flight, operated by British Airways.(BA 565)
Wed 06:45 Rome Leonardo da Vinci Fiumicino (FCO) 3 08:35 London Heathrow (LHR) 5 AA 6603 Non-stop Airbus A321 (321) 2:50 Operates only on 2026-08-19 Codeshare flight, operated by British Airways.(BA 565)
Wed 06:45 Rome Leonardo da Vinci Fiumicino (FCO) 3 08:35 London Heathrow (LHR) 5 AA 6603 Non-stop Airbus A320 (320) 2:50 Effective 2026-08-26 through 2026-10-07 Codeshare flight, operated by British Airways.(BA 565)
Wed 06:45 Rome Leonardo da Vinci Fiumicino (FCO) 3 08:35 London Heathrow (LHR) 5 AA 6603 Non-stop Airbus A321 (321) 2:50 Operates only on 2026-10-14 Codeshare flight, operated by British Airways.(BA 565)
Wed 06:45 Rome Leonardo da Vinci Fiumicino (FCO) 3 08:35 London Heathrow (LHR) 5 AA 6603 Non-stop Airbus A320 (320) 2:50 Operates only on 2026-10-21 Codeshare flight, operated by British Airways.(BA 565)
Sun 09:55 London Heathrow (LHR) 5 13:30 Rome Leonardo da Vinci Fiumicino (FCO) 3 AA 6603 Non-stop Airbus A320 (320) 2:35 Effective 2026-01-04 through 2026-02-01 Codeshare flight, operated by British Airways.(BA 554)
Sun 09:55 London Heathrow (LHR) 5 13:30 Rome Leonardo da Vinci Fiumicino (FCO) 3 AA 6603 Non-stop Airbus A321 (321) 2:35 Operates only on 2026-02-08 Codeshare flight, operated by British Airways.(BA 554)
Sun 09:55 London Heathrow (LHR) 5 13:30 Rome Leonardo da Vinci Fiumicino (FCO) 3 AA 6603 Non-stop Airbus A320 (320) 2:35 Effective 2026-02-15 through 2026-03-01 Codeshare flight, operated by British Airways.(BA 554)
Sun 09:55 London Heathrow (LHR) 5 13:30 Rome Leonardo da Vinci Fiumicino (FCO) 3 AA 6603 Non-stop Airbus A321 (321) 2:35 Operates only on 2026-03-08 Codeshare flight, operated by British Airways.(BA 554)
Sun 09:55 London Heathrow (LHR) 5 13:30 Rome Leonardo da Vinci Fiumicino (FCO) 3 AA 6603 Non-stop Airbus A320 (320) 2:35 Operates only on 2026-03-15 Codeshare flight, operated by British Airways.(BA 554)
Sun 09:55 London Heathrow (LHR) 5 13:30 Rome Leonardo da Vinci Fiumicino (FCO) 3 AA 6603 Non-stop Airbus A321 (321) 2:35 Operates only on 2026-03-22 Codeshare flight, operated by British Airways.(BA 554)
Sun 09:55 London Heathrow (LHR) 5 13:30 Rome Leonardo da Vinci Fiumicino (FCO) 3 AA 6603 Non-stop Airbus A320 (320) 2:35 Effective from 2026-10-25 Codeshare flight, operated by British Airways.(BA 554)
Mon 10:50 London Heathrow (LHR) 5 14:30 Rome Leonardo da Vinci Fiumicino (FCO) 3 AA 6603 Non-stop Airbus A320 (320) 2:40 Valid until 2026-02-02 Codeshare flight, operated by British Airways.(BA 554)
Mon 10:50 London Heathrow (LHR) 5 14:30 Rome Leonardo da Vinci Fiumicino (FCO) 3 AA 6603 Non-stop Airbus A321 (321) 2:40 Operates only on 2026-02-09 Codeshare flight, operated by British Airways.(BA 554)
Mon 10:50 London Heathrow (LHR) 5 14:30 Rome Leonardo da Vinci Fiumicino (FCO) 3 AA 6603 Non-stop Airbus A320 (320) 2:40 Operates only on 2026-02-16 Codeshare flight, operated by British Airways.(BA 554)
Mon 10:50 London Heathrow (LHR) 5 14:30 Rome Leonardo da Vinci Fiumicino (FCO) 3 AA 6603 Non-stop Airbus A320 (320) 2:40 Operates only on 2026-03-02 Codeshare flight, operated by British Airways.(BA 554)
Mon 10:50 London Heathrow (LHR) 5 14:30 Rome Leonardo da Vinci Fiumicino (FCO) 3 AA 6603 Non-stop Airbus A321 (321) 2:40 Operates only on 2026-03-09 Codeshare flight, operated by British Airways.(BA 554)
Mon 10:50 London Heathrow (LHR) 5 14:30 Rome Leonardo da Vinci Fiumicino (FCO) 3 AA 6603 Non-stop Airbus A320 (320) 2:40 Effective 2026-03-16 through 2026-03-23 Codeshare flight, operated by British Airways.(BA 554)
Mon 10:50 London Heathrow (LHR) 5 14:30 Rome Leonardo da Vinci Fiumicino (FCO) 3 AA 6603 Non-stop Airbus A320 (320) 2:40 Effective from 2026-10-26 Codeshare flight, operated by British Airways.(BA 554)
Tue,Sat 11:15 London Heathrow (LHR) 5 14:55 Rome Leonardo da Vinci Fiumicino (FCO) 3 AA 6603 Non-stop Airbus A320 (320) 2:40 Valid until 2026-03-28 Codeshare flight, operated by British Airways.(BA 554)
Wed,Thu,Sat 11:15 London Heathrow (LHR) 5 14:55 Rome Leonardo da Vinci Fiumicino (FCO) 3 AA 6603 Non-stop Airbus A320 (320) 2:40 Effective from 2026-10-28 Codeshare flight, operated by British Airways.(BA 554)
Tue 11:35 London Heathrow (LHR) 5 15:10 Rome Leonardo da Vinci Fiumicino (FCO) 3 AA 6603 Non-stop Airbus A320 (320) 2:35 Effective 2026-03-31 through 2026-10-20 Codeshare flight, operated by British Airways.(BA 554)
Fri 11:40 London Heathrow (LHR) 5 15:20 Rome Leonardo da Vinci Fiumicino (FCO) 3 AA 6603 Non-stop Airbus A320 (320) 2:40 Valid until 2026-02-27 Codeshare flight, operated by British Airways.(BA 554)
Fri 11:40 London Heathrow (LHR) 5 15:20 Rome Leonardo da Vinci Fiumicino (FCO) 3 AA 6603 Non-stop Airbus A321 (321) 2:40 Operates only on 2026-03-06 Codeshare flight, operated by British Airways.(BA 554)
Fri 11:40 London Heathrow (LHR) 5 15:20 Rome Leonardo da Vinci Fiumicino (FCO) 3 AA 6603 Non-stop Airbus A320 (320) 2:40 Operates only on 2026-03-13 Codeshare flight, operated by British Airways.(BA 554)
Fri 11:40 London Heathrow (LHR) 5 15:20 Rome Leonardo da Vinci Fiumicino (FCO) 3 AA 6603 Non-stop Airbus A321 (321) 2:40 Operates only on 2026-03-20 Codeshare flight, operated by British Airways.(BA 554)
Fri 11:40 London Heathrow (LHR) 5 15:20 Rome Leonardo da Vinci Fiumicino (FCO) 3 AA 6603 Non-stop Airbus A320 (320) 2:40 Operates only on 2026-03-27 Codeshare flight, operated by British Airways.(BA 554)
Fri 11:40 London Heathrow (LHR) 5 15:20 Rome Leonardo da Vinci Fiumicino (FCO) 3 AA 6603 Non-stop Airbus A320 (320) 2:40 Effective from 2026-10-30 Codeshare flight, operated by British Airways.(BA 554)
Sat,Sun 11:50 London Heathrow (LHR) 5 15:25 Rome Leonardo da Vinci Fiumicino (FCO) 3 AA 6603 Non-stop Airbus A320 (320) 2:35 Effective 2026-03-29 through 2026-10-24 Codeshare flight, operated by British Airways.(BA 554)
Mon 12:20 London Heathrow (LHR) 5 15:55 Rome Leonardo da Vinci Fiumicino (FCO) 3 AA 6603 Non-stop Airbus A320 (320) 2:35 Effective 2026-03-30 through 2026-10-19 Codeshare flight, operated by British Airways.(BA 554)
Fri 12:20 London Heathrow (LHR) 5 15:55 Rome Leonardo da Vinci Fiumicino (FCO) 3 AA 6603 Non-stop Airbus A319 (319) 2:35 Effective 2026-04-03 through 2026-10-23 Codeshare flight, operated by British Airways.(BA 554)
Thu 15:35 London Heathrow (LHR) 5 19:15 Rome Leonardo da Vinci Fiumicino (FCO) 3 AA 6603 Non-stop Airbus A320 (320) 2:40 Effective 2026-04-02 through 2026-10-22 Codeshare flight, operated by British Airways.(BA 554)

This flight number is listed as serving the following routes:

Rome Leonardo da Vinci Fiumicino (FCO) - London Heathrow (LHR)

All American Airlines flights

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American Airlines flight AA 6603: Multiple routes

FLIGHT SCHEDULE

Direct Codeshare Flights:

American Airlines AA6603

06:45

Rome Leonardo da Vinci Fiumicino (FCO) 3

08:35

London Heathrow (LHR) 5

Effective 2026-04-01 through 2026-07-15

Mon
-

Tue
-

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 565)

Duration: 2:50, non-stop
Airbus A320 (320)

Direct Codeshare Flights:

American Airlines AA6603

06:45

Rome Leonardo da Vinci Fiumicino (FCO) 3

08:35

London Heathrow (LHR) 5

Operates only on 2026-07-22

Mon
-

Tue
-

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 565)

Duration: 2:50, non-stop
Airbus A321 (321)

Direct Codeshare Flights:

American Airlines AA6603

06:45

Rome Leonardo da Vinci Fiumicino (FCO) 3

08:35

London Heathrow (LHR) 5

Effective 2026-07-29 through 2026-08-12

Mon
-

Tue
-

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 565)

Duration: 2:50, non-stop
Airbus A320 (320)

Direct Codeshare Flights:

American Airlines AA6603

06:45

Rome Leonardo da Vinci Fiumicino (FCO) 3

08:35

London Heathrow (LHR) 5

Operates only on 2026-08-19

Mon
-

Tue
-

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 565)

Duration: 2:50, non-stop
Airbus A321 (321)

Direct Codeshare Flights:

American Airlines AA6603

06:45

Rome Leonardo da Vinci Fiumicino (FCO) 3

08:35

London Heathrow (LHR) 5

Effective 2026-08-26 through 2026-10-07

Mon
-

Tue
-

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 565)

Duration: 2:50, non-stop
Airbus A320 (320)

Direct Codeshare Flights:

American Airlines AA6603

06:45

Rome Leonardo da Vinci Fiumicino (FCO) 3

08:35

London Heathrow (LHR) 5

Operates only on 2026-10-14

Mon
-

Tue
-

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 565)

Duration: 2:50, non-stop
Airbus A321 (321)

Direct Codeshare Flights:

American Airlines AA6603

06:45

Rome Leonardo da Vinci Fiumicino (FCO) 3

08:35

London Heathrow (LHR) 5

Operates only on 2026-10-21

Mon
-

Tue
-

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 565)

Duration: 2:50, non-stop
Airbus A320 (320)

Direct Codeshare Flights:

American Airlines AA6603

09:55

London Heathrow (LHR) 5

13:30

Rome Leonardo da Vinci Fiumicino (FCO) 3

Effective 2026-01-04 through 2026-02-01

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Codeshare flight, operated by British Airways. (BA 554)

Duration: 2:35, non-stop
Airbus A320 (320)

Direct Codeshare Flights:

American Airlines AA6603

09:55

London Heathrow (LHR) 5

13:30

Rome Leonardo da Vinci Fiumicino (FCO) 3

Operates only on 2026-02-08

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Codeshare flight, operated by British Airways. (BA 554)

Duration: 2:35, non-stop
Airbus A321 (321)

Direct Codeshare Flights:

American Airlines AA6603

09:55

London Heathrow (LHR) 5

13:30

Rome Leonardo da Vinci Fiumicino (FCO) 3

Effective 2026-02-15 through 2026-03-01

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Codeshare flight, operated by British Airways. (BA 554)

Duration: 2:35, non-stop
Airbus A320 (320)

Direct Codeshare Flights:

American Airlines AA6603

09:55

London Heathrow (LHR) 5

13:30

Rome Leonardo da Vinci Fiumicino (FCO) 3

Operates only on 2026-03-08

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Codeshare flight, operated by British Airways. (BA 554)

Duration: 2:35, non-stop
Airbus A321 (321)

Direct Codeshare Flights:

American Airlines AA6603

09:55

London Heathrow (LHR) 5

13:30

Rome Leonardo da Vinci Fiumicino (FCO) 3

Operates only on 2026-03-15

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Codeshare flight, operated by British Airways. (BA 554)

Duration: 2:35, non-stop
Airbus A320 (320)

Direct Codeshare Flights:

American Airlines AA6603

09:55

London Heathrow (LHR) 5

13:30

Rome Leonardo da Vinci Fiumicino (FCO) 3

Operates only on 2026-03-22

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Codeshare flight, operated by British Airways. (BA 554)

Duration: 2:35, non-stop
Airbus A321 (321)

Direct Codeshare Flights:

American Airlines AA6603

09:55

London Heathrow (LHR) 5

13:30

Rome Leonardo da Vinci Fiumicino (FCO) 3

Effective from 2026-10-25

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Codeshare flight, operated by British Airways. (BA 554)

Duration: 2:35, non-stop
Airbus A320 (320)

Direct Codeshare Flights:

American Airlines AA6603

10:50

London Heathrow (LHR) 5

14:30

Rome Leonardo da Vinci Fiumicino (FCO) 3

Valid until 2026-02-02

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 554)

Duration: 2:40, non-stop
Airbus A320 (320)

Direct Codeshare Flights:

American Airlines AA6603

10:50

London Heathrow (LHR) 5

14:30

Rome Leonardo da Vinci Fiumicino (FCO) 3

Operates only on 2026-02-09

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 554)

Duration: 2:40, non-stop
Airbus A321 (321)

Direct Codeshare Flights:

American Airlines AA6603

10:50

London Heathrow (LHR) 5

14:30

Rome Leonardo da Vinci Fiumicino (FCO) 3

Operates only on 2026-02-16

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 554)

Duration: 2:40, non-stop
Airbus A320 (320)

Direct Codeshare Flights:

American Airlines AA6603

10:50

London Heathrow (LHR) 5

14:30

Rome Leonardo da Vinci Fiumicino (FCO) 3

Operates only on 2026-03-02

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 554)

Duration: 2:40, non-stop
Airbus A320 (320)

Direct Codeshare Flights:

American Airlines AA6603

10:50

London Heathrow (LHR) 5

14:30

Rome Leonardo da Vinci Fiumicino (FCO) 3

Operates only on 2026-03-09

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 554)

Duration: 2:40, non-stop
Airbus A321 (321)

Direct Codeshare Flights:

American Airlines AA6603

10:50

London Heathrow (LHR) 5

14:30

Rome Leonardo da Vinci Fiumicino (FCO) 3

Effective 2026-03-16 through 2026-03-23

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 554)

Duration: 2:40, non-stop
Airbus A320 (320)

Direct Codeshare Flights:

American Airlines AA6603

10:50

London Heathrow (LHR) 5

14:30

Rome Leonardo da Vinci Fiumicino (FCO) 3

Effective from 2026-10-26

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 554)

Duration: 2:40, non-stop
Airbus A320 (320)

Direct Codeshare Flights:

American Airlines AA6603

11:15

London Heathrow (LHR) 5

14:55

Rome Leonardo da Vinci Fiumicino (FCO) 3

Valid until 2026-03-28

Mon
-

Tue

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Codeshare flight, operated by British Airways. (BA 554)

Duration: 2:40, non-stop
Airbus A320 (320)

Direct Codeshare Flights:

American Airlines AA6603

11:15

London Heathrow (LHR) 5

14:55

Rome Leonardo da Vinci Fiumicino (FCO) 3

Effective from 2026-10-28

Mon
-

Tue
-

Wed

Thu

Fri
-

Sat

Sun
-

Codeshare flight, operated by British Airways. (BA 554)

Duration: 2:40, non-stop
Airbus A320 (320)

Direct Codeshare Flights:

American Airlines AA6603

11:35

London Heathrow (LHR) 5

15:10

Rome Leonardo da Vinci Fiumicino (FCO) 3

Effective 2026-03-31 through 2026-10-20

Mon
-

Tue

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 554)

Duration: 2:35, non-stop
Airbus A320 (320)

Direct Codeshare Flights:

American Airlines AA6603

11:40

London Heathrow (LHR) 5

15:20

Rome Leonardo da Vinci Fiumicino (FCO) 3

Valid until 2026-02-27

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 554)

Duration: 2:40, non-stop
Airbus A320 (320)

Direct Codeshare Flights:

American Airlines AA6603

11:40

London Heathrow (LHR) 5

15:20

Rome Leonardo da Vinci Fiumicino (FCO) 3

Operates only on 2026-03-06

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 554)

Duration: 2:40, non-stop
Airbus A321 (321)

Direct Codeshare Flights:

American Airlines AA6603

11:40

London Heathrow (LHR) 5

15:20

Rome Leonardo da Vinci Fiumicino (FCO) 3

Operates only on 2026-03-13

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 554)

Duration: 2:40, non-stop
Airbus A320 (320)

Direct Codeshare Flights:

American Airlines AA6603

11:40

London Heathrow (LHR) 5

15:20

Rome Leonardo da Vinci Fiumicino (FCO) 3

Operates only on 2026-03-20

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 554)

Duration: 2:40, non-stop
Airbus A321 (321)

Direct Codeshare Flights:

American Airlines AA6603

11:40

London Heathrow (LHR) 5

15:20

Rome Leonardo da Vinci Fiumicino (FCO) 3

Operates only on 2026-03-27

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 554)

Duration: 2:40, non-stop
Airbus A320 (320)

Direct Codeshare Flights:

American Airlines AA6603

11:40

London Heathrow (LHR) 5

15:20

Rome Leonardo da Vinci Fiumicino (FCO) 3

Effective from 2026-10-30

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 554)

Duration: 2:40, non-stop
Airbus A320 (320)

Direct Codeshare Flights:

American Airlines AA6603

11:50

London Heathrow (LHR) 5

15:25

Rome Leonardo da Vinci Fiumicino (FCO) 3

Effective 2026-03-29 through 2026-10-24

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun

Codeshare flight, operated by British Airways. (BA 554)

Duration: 2:35, non-stop
Airbus A320 (320)

Direct Codeshare Flights:

American Airlines AA6603

12:20

London Heathrow (LHR) 5

15:55

Rome Leonardo da Vinci Fiumicino (FCO) 3

Effective 2026-03-30 through 2026-10-19

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 554)

Duration: 2:35, non-stop
Airbus A320 (320)

Direct Codeshare Flights:

American Airlines AA6603

12:20

London Heathrow (LHR) 5

15:55

Rome Leonardo da Vinci Fiumicino (FCO) 3

Effective 2026-04-03 through 2026-10-23

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 554)

Duration: 2:35, non-stop
Airbus A319 (319)

Direct Codeshare Flights:

American Airlines AA6603

15:35

London Heathrow (LHR) 5

19:15

Rome Leonardo da Vinci Fiumicino (FCO) 3

Effective 2026-04-02 through 2026-10-22

Mon
-

Tue
-

Wed
-

Thu

Fri
-

Sat
-

Sun
-

Codeshare flight, operated by British Airways. (BA 554)

Duration: 2:40, non-stop
Airbus A320 (320)

This flight number is listed as serving the following routes:

Rome Leonardo da Vinci Fiumicino (FCO) - London Heathrow (LHR)

All American Airlines flights

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