What is the difference between Test Flight and Flight Test? Are they the same thing or synonymous?
Flight testing is the process (usually involving a number of test flights) by which the capabilities and performance of and aircraft (usually a new one or one which is substantially modified) are established.
Test flight refers to an individual flight which is used for testing purpose. it can be used either as part of flight testing or as a standalone for testing some minor modification.
They are synonymous in the business.