Originally Posted by
warreng24
In this case, the question would be is if PIT-ORD-EWR is a legal routing (isn't that known as backtracking?).
If its a legal routing, then only 1 E500 would be pulled.
If its not a legal routing, then 3 E500's would be pulled.
Actually, no. Backtracking/"legal routing" has nothing to do with 500-mile upgrades.
If both segments clear in advance, then one e500 will be pulled at checkin.
If one or both segments do not clear until the gate, then 1+2=3 e500s will be pulled.