By Ambiance, I meant the general aura of peace, goodwill, cooperation, and civility, displayed by both passengers and crew in premium.

My experience has been that there is a much higher likelihood that people will behave like gentlewomen and men in premium class than in coach. Perhaps it is simply that they (persons in premium class) are for the most part more frequent fliers and have a better sense of what to expect and how to deal with the unexpected.

Probably a little more wine and space for both bodies and luggage has a great deal to promote graciousness as well.

Of course, even in first/business I have witnessed people who didn't understand the concept of waiting or sharing overhead bin space or stowing their gear in the most economical way possible. On our flight last week from ORD/SEA there was a totally clueless couple who took up one entire overhead bin for their poorly stowed gear and yelled at a dead heading pilot who attempted to rearrange it to accomodate his bag. Their gear was "too fragile" to be rearranged. The pilot behaved with great grace and dignity.

It occurred to me that who ever gave them the upgrade should have also given them lessons on Flying in First.