Travel chaos erupted at Boston Logan International Airport on Monday after the two incidents, which took place hours apart, saw planes with broken wings and pilots sent to hospital

That was terrible. It was very scary. All of a sudden, 'thump.' It sounded like something fell from below,” one passenger said.

The first collision occurred at around noon on Nov. 25 when an American Airlines flight that had just arrived from London Heathrow Airport and was pulling into its gate when it clipped the wing tip of a parked Frontier plane, American Airlines said in a statement to PEOPLE.