I don't think it is related to code-share flight numbers. My observation is that this happens when there is a change of aircraft with the same flight number (as the example in reply #1). To use the example of the SEA
routing, perhaps it is to avoid confusion at IAD
if the SEA
aircraft (an A319) was delayed coming in to IAD
, while the IAD
aircraft (a 744) was talking to ramp or ready to pushback. They cannot both use UA916. The UA
8000 series flight numbers seem to be used on the domestic legs.
UA 956 SFO->JFK->LHR (762/777)
UA 904 LAX->JFK->LHR (757/777)
(Edited to add specific flights)
[Edited 2005-02-14 21:50:29]
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