Hi Mark
The PAL a/c are equipped and did show up nicely. The returns you saw were from the second hotel I stayed in, which had thick glass and which the signals from the PAL aircraft seemed to have some difficulty penetrating. Currently in Singapore and suffering the same fate, plenty of returns but no positional info.
I'll be putting in updates via GAS website.
If you'd like any more info re Manila, hotels etc feel free to e-mail me, (details in members list).
Steve