There is a world of difference between the way you need to utilise a high cost, high depreciation, new aircraft to the way you can utilise a low cost, written down, (necessarily) older aircraft. You need to generate very high daily revenues with the former but much less daily revenue on the latter can still turn an operating profit. In a nutshell your fixed costs are lower, although of course no "aircraft make(s) money when it's not flying" - that would be a good trick to pull.
I assume that BCA are looking to maximise inbound traffic from France but I feel they need a French language section on their website to achieve that.