Two United Airlines planes clip wings while preparing to depart San Francisco International Airport, according to the FAA

Two United Airlines planes clipped wings at San Francisco International Airport early Tuesday morning while preparing for take off, according to the Federal Aviation Administration.

In the second such incident in less than a month, two airline planes clipped wings at a US airport, this time in San Francisco, according to the Federal Aviation Administration. United Airlines Flight 863, which was headed for Sydney, Australia, was pushing back from the gate at San Francisco International Airport early Tuesday when its right wingtip struck the left wingtip of United Flight 877, headed for Hong Kong, the FAA said in a statement to CNN. The incident occurred about 12:30 a.m. local time “in an area where air traffic controllers do not communicate with flight crews,” the FAA added. “No injuries occurred and passengers on both planes deplaned normally,” a United Airlines spokesperson said in a statement. “We are working with our customers to rebook them on other flights.” The FAA also is investigating an incident last month at Ronald Reagan Washington National Airport involving two American Airlines regional jets that bumped wings. “The wingtip of American Airlines Flight 5490 struck American Airlines Flight 4522 on a taxiway … around 12:45 p.m,” the FAA said in a statement.