<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by Wiggums:
Actually, if it's a United flight number with 3 digits, then you can be sure it's a United flight. United flight numbers that have four digits are usually USAirways or Lufthansa - avoid them.</font>
Not exactly. It's on the ticket jacker, in the schedule, etc. I fly on 4 digit UAL flights every week.
1-1999 UAL
5200-7999 UAX
The rest are US, *A, etc.