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Odd And Even Flight Numbers?  
User currently offlineCSA From , joined Dec 1969, posts, RR:
Posted (14 years 11 months 3 weeks 4 days 7 hours ago) and read 4526 times:

I was checking the SAS timetable and flightindex this morning and found that all the flights southward and westward were odd: example: SK-501 CPH-LHR and that all flights northward and eastward were even flight numbers example: SK-734 CPH-SVO and SK 735 SVO-CPH, this kind of system is maybe valid for other airlines too.

Has anyone ever thought about this before?

Another example is LOT: all outbound flights from Poland have odd flight numbers, example: LO 631 WAW-SOF, and all returning flights to Poland have even flight numbers, example: LO 632 SOF-WAW.

Can anyone give me an approach why the airlines have systems like this?

5 replies: All unread, jump to last
User currently offlineVunz From Netherlands, joined Jun 2001, 361 posts, RR: 1
Reply 1, posted (14 years 11 months 3 weeks 4 days 6 hours ago) and read 4502 times:

It's customary to have an odd outbound flight number, and the following (even) number or the return flight. For instance KL0643 AMS-JFK and KL0644 JFK-AMS. No coincidence here.

I'm not sure about the SK flightnumbers though.

User currently offlineFavre From United States of America, joined Apr 2000, 595 posts, RR: 9
Reply 2, posted (14 years 11 months 3 weeks 4 days 5 hours ago) and read 4487 times:

at nwa we use odd numbers to the west and even to the east....

BAE 146 ARJ CV-580 YS-11 SH360 DASH8 SAAB340 EMB 120-135-145-175 DC9/10/30/40/50 MD80/90 DC10 717 727 737 747 757 767 77
User currently offlineA330_DTW From United States of America, joined Sep 2000, 371 posts, RR: 0
Reply 3, posted (14 years 11 months 3 weeks 4 days 3 hours ago) and read 4471 times:

As Favre said, odd numbers West and even numbers East.

For the international flights, the East-bound flight number is always one number higher than its West-bound counterpart; i.e. flight NW50 DTW-CDG and return flight CDG-DTW is NW49.

Flight NW12 NRT-DTW and NW11 DTW-NRT.

User currently offlineAndyEastMids From United Kingdom, joined Jan 2001, 1107 posts, RR: 2
Reply 4, posted (14 years 11 months 3 weeks 4 days 3 hours ago) and read 4464 times:

As I recall, IATA standard is north/west=odd, south/east=even. However, many airlines ignore this standard.


User currently offlineCSA From , joined Dec 1969, posts, RR:
Reply 5, posted (14 years 11 months 3 weeks 4 hours ago) and read 4429 times:

Thank's guys, have a nice day.

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