At Mesaba now Pinnacle, we always leave a good ten minutes early under Delta Colors, especially when leaving all the old Saab Cities around the upper Midwest. Never heard any complaints about it. If the door was closed early you could always blame it on the anti skid test on the CRJ200 that requires the brake to be released during the test. Not my problem if the door happened to be closed before the test. Haha! .....kind of weird how United seems to be obsessed with not leaving early.