Workers Are Busy with the Expansion Project of Shanghai Pudong International Airport on Dec. 29, 2015.

Construction of the world's largest passenger terminals has begun at Shanghai Pudong International Airport, with completion set for 2019.

The new facilities represent a milestone in Shanghai's quest to become a world-class air transportation hub.

The two new passenger terminals, which will cover 622,000 square meters－larger than the airport's T1 terminal－will boost airport capacity to 80 million passengers annually, a significant increase over this year's 60 million, Shanghai Airport Authority officials said on Tuesday at the launching ceremony for the third phase of the massive extension.

The two satellite terminals, located south of the existing two terminals, will be connected to each other and link to the main terminals via a rapid transit system.