PPR always makes me laugh. It's like having to phone the supermarket each time you go shopping to get permission to park in their car park.
Yes, and about as meaningful in practice in the case of large airfields.
PNR/Customs is more meaningful: the policeman is not normally based there. Of course, they could see the incoming flight plans, which is how UK Designated Customs airport Customs decide whether to turn up or not, but most are not that smart
