51.   And crop-dusting planes were grounded for a second day over fears they could be used in an attack.

52.   But Roman, the head of the aviation agency, said Thursday that the plane was grounded because it had problems with its hydraulics system and landing gear.

53.   Crop-dusting planes were grounded for a second day over fears they could be used in an attack.

54.   Cyprus Airways planes were grounded Thursday for four hours when employees went on a strike to press for more pay.

55.   Delta would not disclose how many planes were grounded, but an airline source who requested anonymity said nine.

56.   Eckhard thanked the Iranians for adhering to the sanctions by grounding the plane, despite pressure from Iraq.

57.   Gen. Hector Hernando Gil, air force commander, said U.S. military planes were involved in grounding the planes.

58.   Hot, dry winds and high temperatures spurred the outbreak and kept fire-fighting planes grounded Saturday.

59.   However, the plane was grounded until further investigation, and its passengers were to be taken to their destination by another aircraft later Tuesday.

60.   In addition, planes have been grounded by bomb threats and a man attempted to start a fire on one flight.