I need help with the following.

1. The commercial airport terminal's passenger handling system is a series of links and processes that facilitate the transfer of passengers between an aircraft and one of the modes of the local ground transportation system. Please explain the different processes that comprise the passenger handling system at airport terminals?
2. Due to the event of September 11, 2001, and the subsequent signing of the Aviation and Transportation Security Act (ATSA), the practice of airport security began to undergo radical changes, beginning with the creation of the Transportation Security Administration (TSA). Are some of the most significant changes in airport security due to the events of September 11, 2001?