For info whilst dominated by Parc and Hacs, International Airline Crewing (IAC) are starting to get a few guys in as well.
Played with figures one day and reckon after 5 years pay between Parc and Hacs was different by $60, IAC was better by around $8,000.
Only suggesting another contractor to consider should you wish to, do your homework on them all and see who gives you the best vibe.