Which regulation abolished the Air Transportation Office in the Philippines?

The correct choice, which indicates that RA 9497 abolished the Air Transportation Office in the Philippines, highlights a significant legislative change in the country’s civil aviation framework. RA 9497, also known as the "Civil Aviation Authority Act of 2008," was enacted to establish a more effective governance structure for aviation, transitioning from the previous Air Transportation Office to the Civil Aviation Authority of the Philippines (CAAP). The establishment of CAAP aimed to enhance the regulation and safety of civil aviation, ensuring better compliance with international standards and improving the overall management of air transportation systems.

Other options represent different laws and regulations that do not pertain to the abolition of the Air Transportation Office. For instance, PD 1570 focuses on the creation of the Bureau of Air Transportation, while RA 776 relates to the charter of the Civil Aeronautics Board. The SOGIE Bill, addressing issues of sexual orientation, gender identity, and expression, is also unrelated to air transportation regulations. Thus, focusing on the context of aviation governance clarifies why RA 9497 is the appropriate choice in this instance.