A Lufthansa's Boeing 747-8 Intercontinental passenger jet arrives at Dulles International Airport outside Washington DC, June 1, 2012. Lufthansa on Friday completed the world's first passenger flight with a Boeing 747-8 Intercontinental, from Frankfurt to Washington DC. [Photo/Xinhua]

Guests visit the business class cabin of a Lufthansa's Boeing 747-8 Intercontinental passenger jet at Dulles International Airport outside Washington DC, June 1, 2012. Lufthansa on Friday completed the world's first passenger flight with a Boeing 747-8 Intercontinental, from Frankfurt to Washington DC. [Photo/Xinhua]