For many years Air Pacific leased a QF B747 200 and even a QF B747 100 in FJ colours. QF crew often flew it on QF runs and FJ often borrowed a QF one in QF colours. Initially AIPA and AIFEA objected but in the end everyone benefited.
That's commercial reality and if the Tiger crews have a problem with that then they aren't very realistic.
Wunwing