Mr. Han is suing United because they issue miles for flights by calculating the distance, in a straight line, from origin to destination.  He thinks that if the flight is routed around a storm and the flight goes 63 miles out of its way to avoid potential problems he should be awarded those miles as well.

This is a link to the actual court documents

This is why there are 22 paragraphs of legalese on the back of a coupon for $0.05 off your favorite shampoo…  People like Han