The first airplanes to land in Haiti where general aviation business aircraft.  Many corporations lent the company airplane to help out with supplies.  A Navajo Chieftain,  the same type ABA flies, was one of the first to bring water and blankets to citizens in Haiti.  Another larger jet, a Challenger, brought workers and supplies.  It took a few days for the military and airlines to ramp up and gain FAA approval to operate into Haiti, but business aircraft were flying into to Port A Pince from smaller airports in the US almost right away.