Dassault Falcon 7X/8X
These tri-jets form the flagship duo of Dassault, based on the Falcon 900EX. The 7X and 8X are bigger, but more important are the more streamlined cockpit windows. The “saw tooth” trailing edge of the vertical stabiliser and the main gear doors are also clear indicators.
At first it was not so difficult to recognise a Falcon 7X because of differences with the Falcon 900 described above gave enough to look for. However with the arrival of the Falcon 8X things changed. The Falcon 7X is a metre shorter than the 8X, so you have to count windows: five windows between the emergency exit and the engines.
The improved version is the slightly longer Falcon 8X. It has more cabin windows than the 7X, with six windows between the emergency exit and the engine nacelle.
Confusion possible with
Given that the Falcon 7X and 8X are derived from it you are most likely to confuse them with the Falcon 900. Look for the differences in cockpit windows and main landing gear doors, and the saw tooth versus straight trailing edge of the vertical stabiliser.
Especially when not having a clear view on the aircraft you might also mistake a Falcon 7X for a Falcon 50. However, when you see the large cabin windows of the latter you will immediately notice that you are wrong.