Five advertising companies (the parties) jointly buy a jet aircraft. They enter into an agreement whereby each party has the right to use the aircraft its own purposes some days each year. The parties may decide use the use that right,or,for example, lease it to a third party. The parties share decision-making regarding maintenance and disposal of the aircraft. The decisions require the agreement of all of the parties. Each party is able to sell its interest to a third party, with the approval if the other parties. The agreement covers the expected life of the aircraft and con be changed only buy if all if the parties agree.