Ruth,I used that airport shuttle once,its funny,the lady at NAIA1 said "Please avail of our free airport shuttle to NAIA3"Thats cool,I got on,just outside NAIA1 the drivers friend came around for the fare You were robbed,I think mine was 10 pesos,you should complain and ask for your refund Theres talk of some form of interior transfer between terminals,shuttle-tunnel or something,but like I said,its just talk Enjoy your trip