Northwest Airline:
International Travel - between North America and Africa / Asia / Europe / India / Middle East)
* Coach Class: Each ticketed passenger is allowed two (2) pieces of checked luggage.
Both pieces: 50 pounds (23 kg) with linear dimensions not to exceed 62 inches (158 cm) per piece.
* World Business Class: Each ticketed passenger is allowed three (3) pieces of checked luggage. One (1) piece of carry-on luggage is allowed per passenger.
1. First two (2) pieces: 70 pounds (32 kg) with linear dimensions not to exceed 62 inches (158 cm) per piece.
2. Third piece: 40 pounds (18 kg) with with linear dimensions not to exceed 45 inches (115 cm).
你箱子超大,不能上飞机.
其实如果你的行李太大及太重,我提仪你用船运去美国,更平点.
参考资料:http://www.nwa.com/travel/luggage/checked.html