Reciprocity conditions may apply to approval of occasional traffic by air carriers based outside the scope of the European Union's aviation law.
"§ 22 
In commercial air traffic that is not scheduled air traffic (occasional traffic), the licensing authority can stipulate conditions and requirements or prohibit transport if this air traffic has a lasting negative impact on public transport interests. The approval of occasional traffic by air carriers based outside the scope of the European Union's aviation law can be made dependent on the existence of reciprocity. Air traffic by the airlines mentioned in sentence 2 and in § 23a sentence 2 with other states can be prohibited or provided with ancillary provisions, provided that this is necessary to protect against adverse effects for air carriers based in the area of ​​application of this Act.
§ 23a 
For the operation of air carriers that have their headquarters outside the scope of the European Community's aviation law, the licensing authority to establish and guarantee reciprocity beyond the provisions of Sections 20 to 23 can impose the same type and effect of restrictions as those of air carriers, who have their headquarters in the area of ​​application of this law are subject to those companies in their home country. The same applies, subject to European Community aviation law, to air carriers that have their headquarters within the scope of Community law, insofar as they carry out air traffic between the Federal Republic of Germany and states outside the scope of Community law.[...]" (Aviation Act (May 10, 2007; Federal Law Gazette I p. 698), last amended by the Act of July 5, 2021 (Federal Law Gazette I p. 2287), Sections 22 and 23a [google translation])
Aviation Act (May 10, 2007; Federal Law Gazette I p. 698), last amended by the Act of July 5, 2021 (Federal Law Gazette I p. 2287), Sections 22 and 23a
[<a href="https://www.gesetze-im-internet.de/luftvg/">Act</a>]