For such a large corporate company, United Airlines is using animation to create some unconventional advertisements. I rustled up an old USAToday article with this quote,

Why drawings? “We really wanted a unique look and feel, and that’s how we hit on the animation and illustration,” says Alex Leikikh, group account director at Fallon Worldwide, the agency that created the ads.

Here’s one of the (award-winning) spots called, “The Meeting,” created by Wendy Tilby and Amanda Forbis :

[youtube=http://www.youtube.com/watch?v=nU5DasW5nUY&rel=1]

You can see other spots at United’s website and read an article/analysis of the ad-series in the Slate archives.