FAYETTEVILLE, N.C. (AP) _ A Boeing 727 Air Mexicana jet made an emergency landing at the Fayetteville Regional Airport today because of a cracked windshield, officials at the airport said.

The jet, en route to Mexico City from Baltimore, landed safely about 9:30 a.m., said Jenny Kuck, assistant airport manager. None of the 34 passengers or nine crew members on board were injured.

Air Mexicana Flight 851 left Baltimore-Washington International Airport at 8 a.m. today and was scheduled to make its first stop in Cancun, Mexico, at 11:40 a.m., officials said.

But the pilot contacted air traffic control about 9:15 a.m., saying he had a cracked windshield, according to Fayetteville air traffic manager Randy Breedlove.

The plane was flying at 31,000 feet when the windshield cracked, Ms. Kuck said.

Federal Aviation Administration officials said they don't know what caused the windshield to crack, but an investigation was under way.

The windshield would either be repaired or passengers would be switched to another aircraft, Ms. Kuck said.