In Czech Republic, the no-fee policy in emergency is part of AIP (GEN 4):
4.1.1.5 Exemptions
Flights of the following aircraft are not subject to the charges:
– aircraft returning due to weather, mechanical or radio failure to the aerodrome of departure and aircraft which have executed a forced or emergency landing.
– flights performed exclusively for the transport of Royalty, Heads of State and Government, Ministers on official missions;
– search and rescue flights authorised by a competent RCC body,
– aircraft carrying out flights of air rescue services including secondary and repatriation flights and flights directly connected with human life rescue;
– flights of the Civil Aviation Authority.