Depends entirely on how the contract / statement of work is structured. If you live in AUS and have clients in DFW, DEN and PHX that you're visiting in a week you seriously might have to book: AUS - DFW, DFW-AUS (Client One), AUS-DFW-DEN-DFW-AUS (Client Two), AUS-PHX-AUS (Client Three) instead of the FAR more efficient AUS-DFW-DEN-PHX-AUS (Which could be done entirely on AA as well). Not saying that makes SENSE, but I've had contracts structured to where it's required.