http://www.veteranstoday.com In 1990 the Department of Defense published a “Chemtrails” manual for pilot training at the USAF Academy..
In the mid-1990′s unmarked military aircraft were observed spraying aerosols from ports located in the wings and around the exhaust of the jet engines.
In recent years, civilian aircraft are increasingly contracted to secretly spray aerosols through ports located near the engines and airframe. This video provides a well documented example of commercial aircraft spraying chemtrails over Gainsville and North Florida involving AIRTRAN airways.
IPCC scientists also admit CO2 from aircraft will grow 3% per year, but make no recommendation about using alternative forms of travel.
While not admitting that aircraft are spraying tons of aerosols into the atmosphere these same scientists say that contrails and artificial clouds have a profound effect on the climate and tend to warm global surface temperatures.
Related:
Airline Mechanic Turns Whistleblower
Caught In The Act: Korean Air 129 En Route From Soeul To Auckland On September 28
NORTHLAND NEW ZEALAND CHEMTRAILS WATCH 
The fact that aircraft are increasing the CO2 at 3% a year and The IPCC are aware and no official body or Government will acknowledge this fits right in with covert geoengineering.The pollution aspect of the chemtrails has amazed me because it is so obvious, even under the name of contrail there is visible increase of pollution. For me it is this lack of acknowledgement that screams wrong, wrong, wrong more than any thing!