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LISBON, PORTUGAL - JUNE 30: Departing passengers queue before airlines counters in Terminal 1 of Lisbon Humberto Delgado Airport in a business as usual day after air controllers called off their strike action on June 30, 2016 in Lisbon, Portugal. Although controllers cancelled their labor protest, the airport will suffer a three-days strike, starting on July 1st, staged by luggage handlers, that is supposed to cause a grave disruption. (Photo by Horacio Villalobos - Corbis/Corbis via Getty Images)

LISBON, PORTUGAL - JUNE 30: Departing passengers queue before airlines counters in Terminal 1 of Lisbon Humberto Delgado Airport in a business as usual day after air controllers called off their strike action on June 30, 2016 in Lisbon, Portugal. Although controllers cancelled their labor protest, the airport will suffer a three-days strike, starting on July 1st, staged by luggage handlers, that is supposed to cause a grave disruption.  (Photo by Horacio Villalobos - Corbis/Corbis via Getty Images)