Aviation Philippines

Hey guys, I was at NAIA recently and had some time to kill between flights, and as I gazed around the airport from the window at the domestic terminal I spied numerous old aircraft just sitting apparently rotting in the sun. They were mostly old C-47s. It got me thinking, so when i got home I opened Google Earth and looked around NAIA from space  he he. What I discovered were many old aircraft just parked.  Included there was at least one Lockeed Constellation. All of these were not near or part of the Philippine air museum, so I don't think they were part of that. anybody know why these planes (some of which have significant value), are just laying waste at NAIA? The photos may be dated.