Final answer:
The counterpart regulation to CFR Title 49 Part 1542 for GA aircraft operation is CFR Title 49 Part 1552, specifically subpart A for flight training involving non-U.S. citizens.
Step-by-step explanation:
The counterpart regulation to CFR Title 49 Part 1542, which governs airport security at commercial service airports, for General Aviation (GA) aircraft operation would be CFR Title 49 Part 1552. This regulation covers flight schools and training. Meanwhile, GA airports could be subject to other parts depending on their specific activities and certification under the Transportation Security Administration (TSA) regulations. For general aviation security measures beyond flight schools, TSA security guidelines and advisories should be consulted rather than a specific part of the CFR. These guidelines can be found through the TSA's General Aviation Security website. For GA operations under flight school regulation, subpart A of Part 1552 specifically relates to flight training for non-U.S. citizens.