OBS_VALUE: <ul><li><a href=https://www.zakonyprolidi.cz/cs/1997-49 target=_blank>Act on Civil Aviation(Zákon o civilním letectví, Act No. 49/1997 Coll., last update on 1 February 2022, § 42a - 42b)</a></li><li><a href=http://lis.rlp.cz/ais_data/www_main_control/frm_cz_aip.htm target=_blank>Aeronautical Information Publication(Aeronautical Information Publication, LKPR AD 2.21)</a></li></ul>