JBo From Sweden, joined Jan 2005, 2290 posts, RR: 0 Reply 1, posted (6 years 3 months 1 week 5 days 23 hours ago) and read 1572 times:
Sometimes it has to do with different aircraft operating under the same flight number .... say BAW213 is a 757 on one leg, then becomes a 767 on the next. If that 767 flight takes off before the incoming flight, it'll depart with a different callsign so the two flights are not confused.
Also, many regional airlines ... at least in the U.S. ... will operate under a different flight number than what's printed in the timetable. i.e., American Eagle flight 4140 will operate on ATC as EGF140 ("Eagle Flight 140"). This may be done for simplicity, but in the case of operators who may operate similar flight ranges for different carriers, avoid confusion on different flight legs.
I'd take the awe of understanding over the awe of ignorance any day.
Viscount724 From Switzerland, joined Oct 2006, 23169 posts, RR: 23 Reply 4, posted (6 years 3 months 1 week 5 days 2 hours ago) and read 1454 times:
If two flights with the same flight number are operating the same day, one of them will also be changed to avoid confusion (e.g. yesterday's flight operating today after a long technical delay, as well as today's flight operating as scheduled).
Just nitpicking, but BAW213, BAW215 etc. are flight numbes, not callsigns. BA's callsign as such is "Speedbird".