Oh good grief, they are everywhere….
Check it out:

The Environmental Protection Agency will soon announce it plans to regulate airline emissions, asserting they contribute to global warming and endanger public health, according to industry and environmental groups.

Those findings will prompt a regulatory process for the EPA to determine and enforce aircraft emissions limits, following a similar effort to limit emissions by cars, trucks and power plants.

But conservatives say higher airplane efficiency standards will only force airlines to raise ticket prices or install more seats on already cramped flights.