Two American Airlines planes from Miami and one from Philadelphia arrived at San Juan's Luis Munoz Marin International Airport Friday morning. The flights carried relief supplies and federal airport screeners to help staff security checkpoints at the airport, an airline spokesman said.
Another plane got halfway to Puerto Rico before returning to Miami because the San Juan airport couldn't handle another plane.
All power to Puerto Rico was knocked out by Hurricane Maria. By late afternoon Friday, no commercial flights had left San Juan because of the logistical obstacles at the airport. With no power, screeners were inspecting carry-on and checked bags by hand.