TrT,
If you're going to the South Rim check out Papillon and Grand Canyon Helicopters as well, they're in the same neck of the woods.. At Maverick you'll meet the pilot before you fly (probably), at Papillon/GCH there are more passengers and you might catch a glimpse of the pilot before boarding the heli, but if you're going there looking for work just ask to speak with Chief Pilot or one of the lead pilots. December may be a bit early for hiring, but then again maybe not, it depends on how many pilots left after the 'season' and how many tourists are forecast to come for a peek at the ditch.