Antoine,a Bush Pilot,agrees to Ferry an Exploration Crew from Gamma

Antoine,a bush pilot,agrees to ferry an exploration crew from Gamma Oil to a remote part of Alberta in his helicopter,and to retrieve them a month later.Three weeks into the bush,the Gamma team learn through listening to local radio chatter on their short-wave radio that Antoine has sold his helicopter to a pilot in New Brunswick.
-If Gamma Oil arranges on its own for another helicopter to pick up the crew,it runs the risk of having to pay both the new pilot,and Antoine,should Antoine have made some alternative provision to honour his obligation to extract the crew.