Air Force warplanes participating in Operation Desert Shield are flying again after they were ordered grounded for 24 hours following a rash of crashes.

Pentagon and Air Force officials said regular training flight schedules resumed Thursday at noon local time (3 a.m. MDT). The flights account for a majority of U.S. air missions in the Persian Gulf region.The Air Force "has not changed anything" in flight operations as a result of the suspension, Capt. A.C. Roper, a spokesman for U.S. Central Command, said in Saudi Arabia.

He said Air Force officials wanted to "examine potential hazards and to be sure they were doing everything possible to prevent accidents.

At the Pentagon, spokesman Pete Williams said the number of U.S. aircraft accidents in the gulf - including three separate crashes this week - were not out of the ordinary. However, suspension of training flights indicated otherwise.