I was checking availability for upgrades on ITN for a RDU-EWR-PHX flight on Sunday, and encountered the following for my flights:

RDU EWR CO438 A2 D2 F0 .......
EWR PHX CO1923 A3 D2 F0 ........

while the another flight pair that shared the first flight segment showed the following:

RDU EWR CO438 A4 D4 F1.......
EWR PHX CO2678 A3 D3 F3..... (America West codeshare, yuck)

Checking the RDU EWR segment alone was showing the same lack of F class as the first.

I should add that I have found F to be available on occasion when checking segments as single one-way flights, but not available as part of a connection.

I called the Elite line and was upgraded on CO438.

Aaaaah, the mysteries of yield management.

[This message has been edited by Old Gold (edited 06-08-2000).]