They perform electrical and static tests and test fly the airplane before delivery.
From the kansas.com
In November 2012 Aviation Week's resident test pilot became the first journalist to test fly the Boeing 787.
From the en.wikipedia.org
Branson says he plans to test-fly a Virgin Boeing 747-400 next year flying on nothing but biofuel, which he is designing with GE, according to Treehugger.com.
From the cnn.com
It's likely test aircraft will fly to South America, where it will be winter.
From the thenewstribune.com
While you are crafting an application via AppMakr, you can also test it on the fly.
From the techcrunch.com
The test jets fly around the world in search of various weather conditions for tests required by the FAA.
From the dailyherald.com
Ten-pound-test fluorocarbon is a good choice for spinning gear and fly leaders.
From the freep.com
Will one of them fly straight in and stick a reducer on Fabio to test that ankle?
From the telegraph.co.uk
Once you fly the 4 test flights no more engines, and the program is over.