From the Baja Bush Pilots Website:
President Vicente Fox signs Decree - 5/18/2005
President Vicente Fox, as directed by the Mexican Congress, signs Decree making change in “Wing Tax”. The new catagories regarding the "wing tax" are as follows:
Wingspan up to 10 meters (& helicopters) NP$ 70.00
(Wingspan up to 33.3 feet)
More than 10 meters & up to 11.1 meters NP$100.00
(More than 33.3 feet & up to 36 feet)
More than 11.1 meters & up to 16.7 meters NP$150.00
(More than 36 feet & up to 55 feet)
The above is as translated by the BBP and the currency is in pesos.
http://bajabushpilots.com/news-pop.php?NewsID=114