An investigation is underway after two passengers gained "unauthorized access" to an American Airlines plane bound for Boston, Massachusetts.
The two passengers were able to open a secured door that was under airport control and enter an aircraft at the Philadelphia International Airport in Pennsylvania Sunday morning.
American Airlines issued the following statement on the incident:
"Two passengers gained unauthorized access to one of our aircraft earlier this morning. Out of an abundance of caution, we are utilizing a different aircraft for the flight to Boston. We apologize to our customers for the inconvenience."
The original aircraft for the flight is undergoing a security sweep.
American Airlines is working with airport authority to find out how the passengers were able to get on the plane.
Foul play is not suspected.
No other information is available at this time.