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Data published earlier this by the consultancy OAG suggests Dublin-Heathrow is the second busiest international air route in Europe.

The aircraft, a Boeing 757-200, was traveling from Newark Liberty International Airport when it received a traffic collision avoidance system alert from the Oakland Air Route Traffic Control Center Airspace, authorities said.

After his death, Quest was involved in other important expeditions, including the 1930-31 British Arctic Air Route Expedition led by British explorer Gino Watkins, who himself tragically died aged 25 while exploring Greenland.

The Sanaa-Amman air route was reintroduced last year as part of a U.N.-brokered cease-fire deal between the Houthis and the internationally recognized government.

The fiasco erupted in the wake of attempts by the government of Antigua and Barbuda to establish a direct air route between the twin isle nation and Central Africa.