Flying Test Beds

Boeing 757-200
Honeywell Flying Test Bed
Phoenix, Arizona

British Aerospace 111
Grumman Corp. Test Bed
Baltimore-Washington Airport
April 23, 2009

Canadair CL-600-2C10
NORTHROP GRUMMAN SYSTEMS CORP
McCarran International Airport, Las Vegas, Nevada
March 24, 2017
Tomás Del Coro

This trio of oddball aircraft just fell into my lap this morning. Previous to this, the only one I was aware of is this Russian job.

The Honeywell airplane is used for testing its business jet engines. The Grumman aircraft are used for testing avionics. Via FlightAware.