 The airport 's problems continued to linger with it into the new millennium . The increasing incidence of terrorism in the Philippines for example forced aviation officials to restrict airport access only to passengers , the sealing of doors and windows at airport terminals being an essential component thereof . However , the airport 's architecture ( which took advantage of natural ventilation ) and lack of air conditioning made the airport 's pre @-@ departure and arrival areas very uncomfortable for passengers to stay in . To counteract this , the Air Transportation Office ( the forerunner of the Civil Aviation Authority of the Philippines ) installed six air @-@ conditioning units at the pre @-@ departure area . Although the installed units were able to provide a degree of comfort to passengers , the ATO recognized that their efforts were inadequate : in order to effectively provide a comfortable environment for passengers throughout the entire terminal building , twenty @-@ three air conditioners needed to be installed . Passenger complaints meanwhile were not limited to just the lack of air conditioning : despite the existence of a baggage X @-@ ray machine , passengers flying other airlines were forced to have their baggage manually checked as the machine was ostensibly for the sole use of Philippine Airlines passengers . 
