Based on the historical profit cycles of the US Airline industry, this most recent exuberance is starting to come to an end. However, as Morgan Stanley notes in their 'deep dive' report, "other revenues" continues to rise as airlines nickel, dime, and benjamin travelers for everything from flushing toilets to extra bags... here, in one simple table, is everything you need to know about Airlines' add-on fees but were afraid to check online...

Is the US airline profit cycle getting old?

Morgan Stanley remains very bullish but we suspect the reality is a different place...

But if they keep upping fees for everything else... who knows...

How long until we have no-money-down, 72-month financing for airline baggage?

Charts: Morgan Stanley