21.   A jetliner of the Dubai-based Emirates airline made an unscheduled landing in Tehran Sunday after a bomb scare aboard, the official Islamic Republic News Agency reported.

22.   A Singapore Airlines passenger jet en route from Sydney to Singapore made an unscheduled landing Thursday after developing engine trouble.

23.   A passenger plane en route from Glasgow to Amsterdam made an unscheduled landing Tuesday after a fire broke out on board, operator easyJet said.

24.   A Virgin Atlantic Airways flight from London to Los Angeles made an unscheduled landing in Edmonton after an unclaimed cellphone was spotted in the economy cabin.

25.   A Royal Airlines plane en route from Toronto to Glasgow, Scotland, made an unscheduled landing Friday after the pilot smelled fumes in the cockpit.

26.   A TWA flight from New York to Milan was forced to make an unscheduled landing at Gander airport because of engine trouble.

27.   Airports in Newfoundland often receive unscheduled landings by trans-Atlantic flights that have equipment problems or security threats, such as bomb scares or air rage incidents.

28.   An American Airlines pilot made an unscheduled landing Sunday after crew members found a box cutter left on the plane by a catering employee.

29.   An Argentine pilot who made an unscheduled landing in the Falkland Islands will face charges of civil aviation violations, a British embassy official said Wednesday.

30.   An airliner made an unscheduled landing after a passenger who was upset about his seating arrangement made a comment about a bomb, officials said.