A United Airlines wing clipped the tail of another aircraft during pushback at Boston airport on Monday.
No injuries were reported, but the Federal Aviation Administration told Insider it is investigating the event.
In early February, two other United planes — a Boeing 787 and a Boeing 757 — collided at Newark, with the latter nearly losing its entire winglet.
About a week later, an American Airlines aircraft crashed into a shuttle bus at Los Angeles International Airport, sending four to the hospital.
Then, in February, a FedEx Boeing 767 cargo plane nearly landed on top of a Southwest Airlines Boeing 737 passenger jet in Austin.