M60
The M60 is the bus that conveniently runs from Columbia to LaGuardia Airport, for which purpose there are luggage racks. It can be rough going if a lot of riders wind up getting on and off as the bus traverses 125th Street in Harlem, but is otherwise one of the best deals in town.
Luckily, Select Bus Service is coming to the M60, meaning the 125th Street stretch will make fewer stops.