The control tower of Changi International Airport in Singapore is seen on March 12, 2019 with the departure terminal at left and the newly constructed Jewel Changi Airport, a doughnut-shaped structure in the background. - Singapore's aviation regulator on March 12, banned the use of Boeing 737 MAX aircraft in the country's airspace following a deadly Ethiopia plane crash at the weekend. (Photo by Roslan RAHMAN / AFP) (Photo credit should read ROSLAN RAHMAN/AFP/Getty Images)
A traveler touches a butterfly in the Butterfly Garden at Terminal 3 (T3) of Changi Airport in Singapore, on Thursday, Dec. 13, 2018. Singapore's Changi Airport, voted the world's best for the past six years by Skytrax, is pursuing that goal of extensive automation with such vigor that it built Terminal 4 to help test the airport bots of the future. Photographer: Nicky Loh/Bloomberg via Getty Images
Incheon, South Korea: Incheon International Airport - ICN - built on reclaimed land joining Yeongjong and Yongyu Islands - Transportation Center - Seoul'main international airport - photo by M.Torres
Indoor Garden at Incheon International Airport
Tokyo, Japan at the control tower of Haneda Airport.
Tokyo, Japan - March 4, 2016: Travelers at departure terminal at Haneda International airport in Tokyo, Japan.
Hong Kong, China - April 15, 2015 : Passengers in the airport main lobby in Hong Kong, China. The Hong Kong airport handles more than 70 million passengers per year.
Storm Clouds Over Hong Kong International Airport
Doha, Qatar - June 21, 2017 : Doha Hamad International Airport, Qatar. The main hall of Hamad International Airport, the international airport of Doha, the capital city of Qatar and one of the major airports in Middle East.
Hamad International Airport in Doha will charge passengers an exit tax
Munich, Germany - May 8, 2011: Square between Terminal 1 and Terminal 2 of Munich Airport (\'Franz-Josef-Strauß-Airport\'). Several travellers are approaching Terminal 2 from the underground station below Terminal 1. To the left a temporary building with a ramp used by the car manufacturer Audi for the presentation of new products. The square is roofed completely. In the background office buildings of Terminal 1.
Munich Airport at Night
Modern art at Munich International Airport, Lufthansa ticket counter, Bavaria, Germany
Control tower of dusk in Central Japan International Airport
Nagoya Japan - September 27, 2014: People travel at Central Japan Centrair Airport in Nagoya Japan.
London Heathrow, April 20, 2016: Heathrow Terminal 5 is an airport terminal at Heathrow Airport. Opened in 2008, the main building in the complex is the largest free-standing structure in the UK
London, England - September 1, 2015: Heathrow Terminal 5 is an airport terminal at Heathrow Airport serving the UK city of London. Opened in 2008, the main building in the complex is the largest free-standing structure in the United
modern airport terminal with black leather seats at sunset.
Zurich Airport, Switzerland
Flughafen Frankfurt Airport. Interior.
Frankfurt, Germany - June 18, 2015: people at security check at Frankfurt international airport in Frankfurt, Germany. In 2012, Frankfurt handled 57.5 million passengers.