American Airlines Flight 1655 was set to depart Philadelphia International Airport at 8 a.m. Sunday, but it did not take off on time due to the incident.
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The airline issued the following statement to Action News:
"Two passengers gained unauthorized access to one of our aircrafts 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."
Investigators are looking into how the two people were able to open a secured door controlled by the airport.
Action News is told foul play is not suspected, as it appears the two people got on the plane by accident.
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Passengers took off from Philadelphia on a new plane shortly before 11 a.m.
American Airlines says this was not considered a security breach because all passengers were vetted by the TSA.
Action News has reached out to Philadelphia International Airport officials for comment.