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.
The M60 is a Select Bus Service route since 2014, meaning that the 125th Street stretch makes fewer stops and that the buses have all-door boarding; one either pays at the bus station with a MetroCard or uses OMNY at any one of the doors. This conversion was initially scrapped in 2013 over unspecific community concerns[1].