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how does the "customs airfield" thing work from, say, Abbeville? Abbeville is deemed to be a customs airfield for arriving in France if sufficient notice is given. So, after visiting the town you decide to fly back to the UK......... is it still a customs airfield for the return flight?
Yes, but still 4 HR PNR to AD operator or by fax to Customs. In practice, they are pretty relaxed about a/c departing to the UK, so if you turn up from Blois, for example, it will only take as long as it takes to process the FPL.
Be careful - very careful!!
The airfield authorities at Abbeville might be very relaxed about you not giving the four hours notice for your return flight but if you haven't and after filing a flight plan, the police turn up before you leave, you will be in trouble.