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Why Two Different Flight #s For The Same Flight?  
User currently offlinekrisyyz From Canada, joined exactly 10 years ago today! , 1593 posts, RR: 0
Posted (3 years 11 months 2 days 4 hours ago) and read 4525 times:

Sorry to ask such a basic question here but I would really like to know why KLM flight 692 left as KLM 32 today.

My mother departed KL 692 yet when I was listening to ATC I heard the KLM flight depart as “KL 32 heavy”. Why are there two flight numbers? Is this a routine occurrence or are there other factors that may change a flights callsign? Is it only KLM that does this ?


Most flight tracking websites like Flightaware and flightview have both KL 692 and KL 32 listed but only KL 32 as “departed”.



Any insight is greatly appreciated.

KrisYYZ

[Edited 2010-12-29 16:32:18]

7 replies: All unread, jump to last
 
User currently offlineSB From United Kingdom, joined Aug 2006, 216 posts, RR: 0
Reply 1, posted (3 years 11 months 2 days 3 hours ago) and read 4499 times:

The ATC callsign is sometimes different from the commercial flight number for operational reasons - usually to avoid having similar callsigns on the same frequency at the same time (KLM692 and 926 for example).

The ATC callsign can also contain letters, for example BA92 which operates YYZ-LHR used to file as BAW7CA for a while. Substitutions are most common in Europe.

S.



"Confirm leave the hold and maintain 320kts?!"
User currently offlineMir From United States of America, joined Jan 2004, 21798 posts, RR: 55
Reply 2, posted (3 years 11 months 2 days 3 hours ago) and read 4494 times:

Quoting SB (Reply 1):
The ATC callsign is sometimes different from the commercial flight number for operational reasons - usually to avoid having similar callsigns on the same frequency at the same time (KLM692 and 926 for example).

Or another airline's flight 692.

-Mir



7 billion, one nation, imagination...it's a beautiful day
User currently offlineIAHFLYR From United States of America, joined Jun 2005, 4790 posts, RR: 22
Reply 3, posted (3 years 11 months 1 day 23 hours ago) and read 4432 times:

Quoting Mir (Reply 2):
Or another airline's flight 692



More often it is only when another flight for the same airline is in the air, regardless of where the flights are located. There are many instances of the same flight number operating with different airlines. It then is something ATC should alert both operators of the similar sounding call signs on the same frequency.



Any views shared are strictly my own and do not a represent those of any former employer.
User currently offlineMir From United States of America, joined Jan 2004, 21798 posts, RR: 55
Reply 4, posted (3 years 11 months 1 day 22 hours ago) and read 4429 times:

Quoting IAHFLYR (Reply 3):
There are many instances of the same flight number operating with different airlines. It then is something ATC should alert both operators of the similar sounding call signs on the same frequency.

Air India 111 and Aer Lingus 111 used to arrive at JFK right about the same time. They changed it after a while so that Air India 111 and Aer Lingus 11C arrived at about the same time (obviously, Aer Lingus uses "Shamrock" for their callsign).

-Mir



7 billion, one nation, imagination...it's a beautiful day
User currently offlineIAHFLYR From United States of America, joined Jun 2005, 4790 posts, RR: 22
Reply 5, posted (3 years 11 months 1 day 22 hours ago) and read 4428 times:

[quote=Mir,reply=4]Air India 111 and Aer Lingus 111 used to arrive at JFK right about the same time. They changed it after a while so that Air India 111 and Aer Lingus 11C arrived at about the same time (obviously, Aer Lingus uses "Shamrock" for their callsign).[/quote

Exactly.

The call sign of the individual operator doesn't matter, regardless of Southwest 7 and Continental 7 both on the same frequency at the same time, it is a similar sounding call sign which needs to be brought to the attention of the flight crew. If both landing at the same airport as you mention in the JFK situation, then yes somebody needs to change the flight number to avoid any possible confusion. Toss in the mix different states the flights come from and there is even more of a reason to fix any issues.



Any views shared are strictly my own and do not a represent those of any former employer.
User currently offlinejwenting From Netherlands, joined Apr 2001, 10213 posts, RR: 19
Reply 6, posted (3 years 11 months 1 day 21 hours ago) and read 4409 times:

Or ATC can assign different numbers to different legs of the same flight.


I wish I were flying
User currently offlinekrisyyz From Canada, joined exactly 10 years ago today! , 1593 posts, RR: 0
Reply 7, posted (3 years 11 months 1 day 14 hours ago) and read 4338 times:

Thank you everybody for answering my question.

KrisYYZ


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