A380 MSNs in order of construction: 001, 004, 002, 007, 003, 005, 006. The aircraft with MSNs 001 and 004 will be the first and the second to fly. They will be used for airframe and systems certification. 002 and 007 will be used for cabin and route trials. 003 will be the first aircraft delivered to Singapore Airlines.
From:
http://www.flightdailynews.com/farnb...port/mega.shtm
http://www.luftfahrtstandort-hamburg...ero380_1.shtml
Airframes intended for ground testing only are numbered 5000 and 5001.