Which expressway connects eastern Beijing with the airport located 32 km northeast of Beijing's city center?
2nd Airport Expressway: The 2nd Airport Expressway (), officially numbered S51, is a toll expressway that connects eastern Beijing with Terminal 3 of Beijing Capital International Airport. Beijing Capital International Airport:  It is located 32 km northeast of Beijing's city center, in an enclave of Chaoyang District and the surroundings of that enclave in suburban Shunyi District.
The 2nd Airport Expressway