SAN FRANCISCO (CBS SF) — A United Airlines flight Sunday morning turned back to San Francisco International Airport because of a mechanical problem, an airport official said.

United Airlines Flight 1721 was on its way to Kona International Airport in Hawaii when it turned around and made an emergency landing.

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Airlines spokeswoman Maggie Schmerin said the problem was a maintenance issue.

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The plane landed safely at about 10:30 a.m. and another plane was going to be used to take the passengers on their trip.

That plane was expected to depart at 1 p.m. Pacific time, according to Schmerin.

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