Remove the three 14.3mm T7 Torx screws from the bottom of AirPort.
Remove the 5.1mm Phillips screw from the bottom of the AirPort. This screw is located under the identification sticker. You will have to remove the sticker or make a hole to remove it.
Lift the bottom and top casing straight apart and then lift metal casing straight up from the bottom plastic casing.
Unplug the black connector on the top of the metal casing by gently pulling horizontally.
Remove four 1mm phillips screws from the bottom.
Separate the top and bottom of the metal casing. You will now expose the motherboard and AirPort card.
To remove the AirPort card, gently pull the plastic tab horizontally.