Regulation (EU) 2018/395
Balloons shall have a certificate of airworthiness issued in accordance with Regulation (EU) No 748/2012 or, in the case of a balloon registered in a third country, shall be subject to either a wet lease agreement or a dry lease agreement in accordance with point BOP.ADD.115.
BOP.ADD.115 Wet lease and dry lease of a balloon registered in a third country