A small part of the wing on a U.S. Airways plane dislodged and hit a passenger window as it flew over Maryland, according to the airline.

No injuries were reported aboard the Boeing 757 twin-jet airliner traveling on Easter from Orlando to Philadelphia with 174 passengers and six crew members aboard, U.S. Airways said.

The plane landed safely in Philadelphia.

A fax from U.S. Airways' security office indicated that the 17.5 square-inch piece of a wing cover might have fallen somewhere in Prince George's or Anne Arundel counties or near Kent Island, according to Anne Arundel County Fire department Division Chief Michael Cox.

The plane out of service and the airline is investigating.