After the demise of Germania — an airline for which Sundair had previously operated wet-leases — in early 2019, Sundair announced it would base aircraft at Dresden Airport and Bremen Airport and take over several of Germania's routes.[3][4]
In May 2023, German tour operator Schauinsland Reisen acquired a majority ownership in Sundair and its Croatian sister company FlyAir41, subsequently revising the airlines' corporate design.[2] In August 2023, Sundair's CEO bought the naming rights of defunct Air Berlin.[5]
In 2024, Sundair announced it would withdraw the aircraft it had based at Kassel Airport since 2017.[6]