Two types of permanent aeodrome licence - 'public use' and 'ordinary use' - are granted by the CAA in accordance with Article 211 of the Air Navigation Order (ANO) 2009. The essential differences between the two are that the hours of availability of a 'public use' licensed aerodrome must be notified in the UK Aeronautical Information Publication (AIP) and the aerodrome must be available on equal terms and conditions to all persons permitted to use it. An 'ordinary use' aerodrome may only be used by the licence holder and those persons specifically authorised by them (i.e. with prior permission). Operations at an 'ordinary use' aerodrome are normally of the general aviation type.