MDC Max Dätwyler AG is major firm, mainly non-aero. Plant at Bleienbach-Langenthal is major aircraft FBO, also creating own designs: MDC Trailer (1962) based on Piper PA-18, Lerche (1967) based on Jungmann and original MD3 Swiss-Trainer (12 August 1983). In 1991 all aero business gathered into new company, MDB Flugtechnik AG.