It’s exactly what google translate says
It’s a one-off (or, depending on context, punctual, i.e. on time for appointment/restaurant/shop)
Doesn’t really help though
It’s completely meaningless to me In the context I think it means “customs/immigration PNR”, possibly with a €€€ fee.
I think Abbeville (LFOI) now still offer customs but only for organised events of group aircrafts (some Piper Cubs gathers annually in June at Abbeville then fly Crotoy beach in Bay de Some)
What it means (the French version) is that it is available ‘every now and then’. The way to know if it is available or not is to call the phone number given there.
I confirm for Abbeville LFOI. I called the manager a few month ago and he said « the more airplanes you are, the more chances customs will come and authorize tour entry ».
It hosts the chipmunk or bulldog (not sure) annual fly-in so I guess it works at least once a year
Le treport must be the same.