Travelers walk past an Emirates Airlines ticket desk at JFK International Airport in New York, U.S., March 21, 2017. Image for illustrative purposes.

A worker cleans behind Etihad airlines counters at JFK International Airport in New York, U.S., March 21, 2017. REUTERS/Lucas Jackson

Travelers wait to check in at an Egypt Air counter at JFK International Airport in New York, U.S., March 21, 2017. REUTERS/Lucas Jackson

The tail of a Saudia Airlines plane stands at a gate at JFK International Airport in New York, U.S., March 21, 2017.

A sign for Turkish Airlines stands near the counters inside of JFK International Airport in New York, U.S., March 21, 2017. REUTERS/Lucas Jackson

A screen showing where travelers check in for Royal Jordanian airline stands at JFK International Airport in New York, U.S., March 21, 2017. REUTERS/Lucas Jackson

A sign for Turkish Airlines stands near the counters inside of JFK International Airport in New York, U.S., March 21, 2017. REUTERS/Lucas Jackson

Family members say good bye at an Emirates Airlines ticket desk at JFK International Airport in New York, U.S., March 21, 2017. REUTERS/Lucas Jackson

Travelers wait at an Emirates Airlines ticket desk at JFK International Airport in New York, U.S., March 21, 2017. REUTERS/Lucas Jackson

FILE PHOTO - A security official looks at a screen displaying X-ray screened parcels in Turkish Post's (PTT) postal logistic centre at the Ataturk International airport in Istanbul, Turkey on November 6, 2010. REUTERS/Murad Sezer/File Photo

A sign for Qatar airlines hangs at JFK International Airport in New York, U.S., March 21, 2017.

A traveler speaks to an agent at an Egypt Air counter at JFK International Airport in New York, U.S., March 21, 2017. REUTERS/Lucas Jackson

Image used for illustrative purpose. An Etihad plane stands parked at a gate at JFK International Airport in New York, U.S., March 21, 2017.

A traveler walks past a sign for Royal Jordanian airline at JFK International Airport in New York, U.S., March 21, 2017.

An Emirates Airlines ticket desk stands empty at JFK International Airport in New York, U.S., March 21, 2017. Image used for illustrative purpsoe.

FILE PHOTO - A security official looks at a screen displaying X-ray screened parcels in Turkish Post's (PTT) postal logistic centre at the Ataturk International airport in Istanbul, Turkey on November 6, 2010.

An Etihad plane stands parked at a gate at JFK International Airport in New York, U.S., March 21, 2017. REUTERS/Lucas Jackson

A sign for Turkish Airlines stands near the counters inside of JFK International Airport in New York, U.S., March 21, 2017. REUTERS/Lucas Jackson