 British Air Ferries (BAF), for example, operated its Carvairs in a flexible configuration, either accommodating five cars and 22 passengers or two-three cars and 55 passengers, permitting it to change over from one configuration to the other in about 40 minutes.In addition, the DC-4's lack of pressurisation made it ideal for low-altitude cross-Channel flights that did not go high enough to require a pressurised cabin.This made the proposed structural conversion straightforward.