Since most brokers usually act as the middlemen, facilitating the transaction on behalf of either the owner or the seller, part exchanging / trading an aircraft is a lot rarer than in the automotive industry for example. Unless you’re lucky enough to come across an owner who’s looking to swap with your aircraft, the only way to part-exchange an aircraft is by finding an Aircraft Broker that physically buys and sells aircraft. In Europe this is possible with Aviation Sales International based out of Germany and Wilco Aviation based in the UK.