Challenger 604 Comments:
Maintenance: As with any aircraft, a maintenance program such as "smart parts" (not very familiar with the different options out there) is absolutly necessary to keep the boss happy (airworthy aircraft with no questions). My experience with the 604 is that it rarely breaks, but items do come up now and then. Our last item was the #2 nav/com computer.
Reliability: We've never had a dispatch problem - which may be attributable to the maintenance progam.
Weak Points: Gally is up front - this can get annoying when the FA is preparing multi-course meals. The jumpseat is a JOKE. Our direct TV is very sensitive (not so much a 604 issue unless it has to do with installation in 604s all over, I'm not sure on that). Disconnecting the batts. is cumbersom and the refueling system is stupid (almost forced to control refueling from inside the cockpit). Baggage area is somewhat weak - we bulk out very often. Bombardier support SUCKS! It's a bit squirly on landing (you have to MANUALLY deploy the ground spoilers - hello?) but then this factor could be my lack of piloting abilities, too!
Stong Points: Good "bank for the buck" as I understand. Roomy cabin and cockpit, killer avionics if you have all all the upgrades (autotrhottle, performance FMS, etc). Good performance capabilities. Payscales are obviously high (or should be). Passengers love the room and stand-up head and access to baggage inflight.
PM if you have more questions...
AZT