Among many airlines, among many airports, from which I can choose for business and for leisure travel, I choose CO because their fares are usually competitive, their service is always gracious and accomodating, their aircraft are clean and comfortable, and their flights are most often reliable.

The ease and versatility of their OnePass frequent flier program is just icing on the cake (except for its international upgrade provision, which is the rotten cantaloupe in the corner stinking up the entire kitchen).