I wish United would use "Rhapsody in Blue" more often. It could be used on almost any occasion, and it fit any mood: majestic, lonely, silly, joyful, serious, etc. It is a link with the past, and could support future needs.

The slogan "Uniting the World" would be a perfect pitch in today's world, and sine the name of the airline is United, using this slogan from the past should not offend any former Continental fans - just like "Friendly Skies".