United Airlines plane en route from San Francisco to Boston had to be diverted due to a damaged wing. The Boeing 757-200 with 165 passengers on board landed in Denver to fix "a problem with a slat" It is unclear what caused the damage.
The US Federal Aviation Administration said it was investigating the incident. Boeing is under pressure after an incident in January when an Alaska Airlines Boeing 737 Max 9 lost a part of its fuselage while flying over the US state of Oregon.