How about standby on an international connection?
Real-life upcoming example:
I'm booked on UA 944 ORD-FRA 2:30p-5:45a. I have a connection within Germany on Lufthansa FRA-HAJ.
I'm booked on the second FRA-HAJ flight (LH 1002) of the day, which departs at 9:45 and arrives HAJ at 10:35.
An earlier FRA-HAJ (LH 1000) leaves at 8:15a and arrives HAJ at 9:05a.
Is there any chance that I can standby for the earlier FRA-HAJ flight, rather than waiting 4 hours in Frankfurt Airport? Or better yet, has anyone ever been able to swap into an earlier connecting flight before ever reaching their target country?