Nothing less than the GA Award.
The award had provisions for a casual hourly rate too. This is roughly $51.50 for a single in the 210 range, and about $65 for a twin in the baron range from memory with a 2 hours paid minimum per day worked. Both figures are VFR. If you are required to have an IR for IFR flying then add a bit on to those. Super should be at 9% of weekly wage ON TOP. Overnights should be in the realm of $120ish, and waiting time should also be paid after a certain amount of hours.
Gives you an idea...