My company basically lets me do what I want, as long as it doesn't cost them anything. We have an agreement with QF, but I prefer star alliance. So, they make me pay the difference between QF and SQ, UA, or whoever, unless I can justify it. But I can usually come up with a business reason for not going QF - always in the timing of the flight... QF flights just never seem to fit my schedule

They will also let us u/g a USA or Europe return to a RTW (once again, if we cough up the $$$).