Generally speaking, people are getting heavier and heavier. The overweighted population now represents over 75% of the US population. How much this excess weight has represented in operational costs for airlines if compared to the early 90s?
I once read that the 400lbs of painting a 747 needs for its livery costs an extra U$ 40.000 per year in fuel.
There are certainly other costs, such as extra room space, the development of special meals, etc...
Poor airlines... They just can´t get a break for the rising costs, but anyways, which itens would cause an impact in their balance sheet? How much would be that?