What do they do if they have a 737-700?
I knew I'd seen this mentioned somewhere. http://experts.about.com/e/b/bo/Boeing_737.htm
When referring to variants of the 737, Boeing and the airlines often collapse the model (737) and the capacity designator (-300, -800, etc.) into a smaller form, either 733 or 738. The exception is the 737-700, which is abbreviated as 73G, in order to avoid confusion with the model number itself. These notations may be found in aircraft manuals or airline timetables.
