Flights crossing state-borders from/into LSZI (ATC Flightplan mandatory!) for Pilots / Passengers without needing a VISA and without articles below customs-limits are possible. Besides PPR, a Customs-declaration must be filled out and stored: earliest 24 h and latest 1:30 before arrival-time / departure-time respectively. The form for the returnflight can be stored simultaneously.
Latest 1:15 h before planned arrival or planned departure one has to contact the aerodrome-office +41 62 871 22 22 to activate the stored customs-declaration(s).
Without confirmation of Customs-declaration-activation it’s not allowed to arrive from abroad or depart abroad.