Around 1999 / 2000 at the height of the dot-com bubble, every company under the sun changed its name to add a ".com" suffix to its name in any advertising - it was deemed to somehow transform a company from being a bunch of old fashioned codgers into a go-ahead new age forward thinking bunch of visionaries.
Move on 12 years, and the Interweb is now completely ingrained into life in both Europe and the wider world - or at least everyone who's likely to fly with Easyjet. Very few companies now seem to make a major point of emphasising that they are a dot-com - it's become the standard sales channel replacing the phone and it's almost taken for granted by consumers.
If anything, the simpler a company's logo is, the more likely it is to get noticed by consumers. Do Easyjet therefore even *need* to put "easyJet.com" on their planes, when a simple "easyJet" would suffice and cause less clutter in the appearance of their aircraft to passengers or rival airlines ?