Mitch was reportedly in the first class lounge, pacing up and down as he talked on his cell phone.
He was scheduled to perform at the Blue Note in New York City, but canceled the performance.
Wanna party with Justin Bieber ... you gotta sign on the dotted line! We got our hands on the contract JB makes all his guests sign ... and it seems outrageous and totally douchey -- but maybe it isn't. We'll explain.Plus, Lil Scrappy dodges jail time by claiming he's…
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