Is URL advertising on planes the need and mantra of the hour for airlines or just LCC's?

Website
http://www.hapagfly.com/westsite/conten ... 01036.html
Boeing 737-800.
Regn # D-AHFN
Photo courtesy by Paulo Carvalho
Other Pictures http://www.hapagfly.com/westsite/conten ... 01392.html
http://www.hapagfly.com/westsite/conten ... 01393.html
Air Deccan too has recently added its url on its planes https://www.aviation24.be/postt9255.html
