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Same Flight Number Airborne Twice  
User currently offlineDon81603 From Canada, joined Jul 2005, 1185 posts, RR: 0
Posted (7 years 6 months 1 week 1 day 19 hours ago) and read 2471 times:

I've been wondering about this for a few days. Is itpossible to have 2 aircraft in the air with the same flight number? For Example: United 863, ORD to SYD is usually an A320 from ORD to SFO, then a 744 from SFO to SYD. Let's say the ORD SFO leg is running extremely late, and isn't due to land until 3 hours after the SFO -SDY leg leaves. Can both flight 863's be in the air at the same time, or would they hold the SFO-SYD leg until the ORD-SFO landed?


Eagles may soar, but weasels don't get sucked into jet engines.
7 replies: All unread, jump to last
 
User currently offlineCitationJet From United States of America, joined Mar 2003, 2425 posts, RR: 3
Reply 1, posted (7 years 6 months 1 week 1 day 18 hours ago) and read 2459 times:

They wouldn't hold the second flight just to avoid duplicate call signs. Most likely they would change the call sign of the second flight slightly (like adding an extra digit on the front). The would only be for ATC, as far as the passengers are concerned, there would be no difference, except for the thru passenger from ORD to SYD who has now missed his "connection".


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User currently offlineIAHFLYR From United States of America, joined Jun 2005, 4790 posts, RR: 22
Reply 2, posted (7 years 6 months 1 week 1 day 6 hours ago) and read 2383 times:

Quoting CitationJet (Reply 1):
They wouldn't hold the second flight just to avoid duplicate call signs. Most likely they would change the call sign of the second flight slightly (like adding an extra digit on the front). The would only be for ATC, as far as the passengers are concerned, there would be no difference, except for the thru passenger from ORD to SYD who has now missed his "connection".

Some airlines add the above mentioned extra digit while others will tag a letter to the end of the flight number, ie., AAL122W, again simply for ATC purposes, the passengers will never know unless UA CH 9 is working.



Any views shared are strictly my own and do not a represent those of any former employer.
User currently offlineHighFlyer9790 From United States of America, joined Jul 2005, 1241 posts, RR: 0
Reply 3, posted (7 years 5 months 3 weeks 6 days 18 hours ago) and read 2160 times:

Quoting IAHFLYR (Reply 2):
Some airlines add the above mentioned extra digit while others will tag a letter to the end of the flight number, ie., AAL122W, again simply for ATC purposes, t

some european airlines have started this, especially BA, where ATC callsigns now more often than not end in a letter- for example BAW51G LHR-BOS or BAW14G BOS-LHR.



121
User currently offlineRoseFlyer From United States of America, joined Feb 2004, 9503 posts, RR: 52
Reply 4, posted (7 years 5 months 3 weeks 6 days 18 hours ago) and read 2154 times:

Quoting Don81603 (Thread starter):
Can both flight 863's be in the air at the same time, or would they hold the SFO-SYD leg until the ORD-SFO landed?

I believe that United uses the call signs 81XX for duplicate flights that could potentially be in the same airspace at the same time. If there is any possibility at all that one flight with the same number will be delayed, then one of the flights will have the flight plan list a different number. Passengers would never know this unless they are listening to ATC communications.



If you have never designed an airplane part before, let the real designers do the work!
User currently offlineNecigrad From United States of America, joined Sep 2001, 183 posts, RR: 0
Reply 5, posted (7 years 5 months 3 weeks 6 days 8 hours ago) and read 2125 times:

HP makes them "Alpha" flights. AWE558 would become AWE558A to ATC.

User currently offlineWestWing From United States of America, joined Feb 2005, 2134 posts, RR: 7
Reply 6, posted (7 years 5 months 3 weeks 6 days 7 hours ago) and read 2114 times:

Quoting RoseFlyer (Reply 4):
I believe that United uses the call signs 81XX for duplicate flights that could potentially be in the same airspace at the same time. I

Yes, but I was recently on a flight from IAD to ORD where the callsign was 851C.
So they were united-eight-fifty-one-charlie-heavy ... quite a mouthful.

This is the first time I had heard a callsign like this on United and one of the controllers en-route at Indy Center even remarked about it being an unusual callsign.



The best time to plant a tree is 40 years ago. The second best time is today.
User currently offlineEWRCabincrew From United States of America, joined May 2006, 5523 posts, RR: 56
Reply 7, posted (7 years 5 months 3 weeks 4 days 16 hours ago) and read 2027 times:

CO uses a 5XXX flight number when that happens. Say if flight 51 was delayed FRA-EWR and in the air when the continuation of 51 EWR-IAH left, the EWR-IAH leg would be flight 5051.

Customers wouldn't notice, but for ATC and Sonic (our res system) would notice.



You can't cure stupid
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