I like the materials that airlines produce to sell ad space either on their inflight programming or elsewhere. Like other media kits produced by publishers, they contain useful demographic, psychographic, and behavioural information about the segments that advertisers can reach.
The image below shows that a large proportion of easyjet flyers are in the higher social classes and, therefore, likely to have more money to spend. Despite the airline's budget positioning, a good proportion are in management positions and also fly for business—all attributes that suggest they’ll have money to spend on the products being advertised to them.