The airline transport pilot license (ATPL), or in the United States of America, an airline transport pilot (ATP) certificate, is the highest level of aircraft pilot certificate.
In the United States, those certified as airline transport pilots (unconditional) are authorized to act as pilot in command on scheduled air carriers' aircraft under CFR 14 Part 121.[1] In EASA states and the United Kingdom, pilots must hold an ATPL before they can be pilot in command of a multi-pilot aircraft flown for commercial air transport operations.[2][3]
CAA-A was invoked but never defined (see the help page).CAA CPL was invoked but never defined (see the help page).