Techspec From United States of America, joined Sep 2001, 70 posts, RR: 0 Reply 2, posted (12 years 2 months 2 weeks 2 days 7 hours ago) and read 1006 times:
Majority of airlines use their own pilots. Each airline have their own procedures determining who performs the Maintenance Check Flights.
The flight profile is determined by the extent of the check flight. Typically all operating altitudes are used in order to perform the appropriate checks. For example, 737 flight control tests begin at 35,000 ft for high speed trim tests and conclude at 10,000 ft for low speed dirty (gear and flaps extended) test.