Simplify the following text for a Grade 8 native English-speaking person.
Original: After the attacks , the flight number for flights on the same route at the same takeoff time was changed to American Airlines Flight 25 , and a Boeing 757 was used instead of a Boeing 767 .
Simplified: After the attacks , the flight number for flights on the same route with the same takeoff time was changed to American Airlines Flight 25 .