There is also an FAA permit (paper about 5x7) mounted near the entrance door. Location vaires depending on aircraft. Easier to read then the metal plate. There are 2 numbers. The N (tail number/FAA number) and the AA plane ID number that is on the front wheel door. This is a 3 digit number. For 777 it is 7XX (it started at 7AA) for 757 it is 5XX (started at 5AA). They do not use I,O and Z in this ID. Not sure of the rest.