don81603
Posts: 1105
Joined: Sun Jul 24, 2005 12:07 am

Same Flight Number Airborne Twice

Tue Jan 23, 2007 10:00 am

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?
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citationjet
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Joined: Sun Mar 09, 2003 2:26 am

RE: Same Flight Number Airborne Twice

Tue Jan 23, 2007 10:26 am

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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IAHFLYR
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Joined: Sat Jun 25, 2005 12:56 am

RE: Same Flight Number Airborne Twice

Tue Jan 23, 2007 10:40 pm

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.
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highflyer9790
Posts: 1189
Joined: Thu Jul 07, 2005 1:21 am

RE: Same Flight Number Airborne Twice

Sat Feb 03, 2007 10:28 am

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
 
roseflyer
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RE: Same Flight Number Airborne Twice

Sat Feb 03, 2007 11:05 am

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!
 
necigrad
Posts: 173
Joined: Thu Sep 13, 2001 2:25 am

RE: Same Flight Number Airborne Twice

Sat Feb 03, 2007 8:32 pm

HP makes them "Alpha" flights. AWE558 would become AWE558A to ATC.
 
WestWing
Posts: 1133
Joined: Thu Feb 03, 2005 2:01 am

RE: Same Flight Number Airborne Twice

Sat Feb 03, 2007 9:55 pm

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.
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EWRCabincrew
Posts: 4306
Joined: Mon May 08, 2006 2:37 am

RE: Same Flight Number Airborne Twice

Mon Feb 05, 2007 12:27 pm

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.
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