KVS,
I have been having an issue lately with looking at flight departing the same day. For instance, I just tried looking up flights from SFO-MRY, and it came back with the error response of flight availability for today. However, there are still many flights left for SFO-MRY for today, and this was also all done on the Apollo: ITN/UA search...I haven't tried the others.
My understanding was the tool would gather all flight info and display whether the flight was past schedule, cancelled, or if it's still yet to go, display the availability. This is where the value of the tool is for me (same day lookup). Am I missing something here?