All depends on what planes they have (or have contracted with), where they are going at the time, and what is already scheduled to be loaded. The software they use is very sophisticated to sort out the balancing act between "fastest" and "most economical (for them)". It may be far more cost effective to take a roundabout route using already committed aircraft, than it would be to pay a premium for a small load on a direct flight.
2012 Ford F-150 Eco, SCrew, 4x4, MaxTow, HD Payload
SOB, used to be:Jayco 26.5 RLS