Errol Cossey became convinced that he could offer Intasun these rates without difficulty, and do a lot more business with it, if Dan-Air had more modern aircraft with a substantially lower fuel-burn and overall lower direct operating costs in its fleet. He was also aware that Britannia Airways, Thomson Holidays' sister airline and Dan-Air's main rival in the charter market, had already begun building up a fleet of brand-new Boeing 737-200 jet planes, which had lower operating costs and a better operational performance than the older, second-hand jets operated by Dan-Air.