chemtrail and contrails both alter the weather , no a contrail wont drop you dead. But when you have "unnatural" contrails lingering for hours you are now making clouds, clouds radiate heat . Now there changing the weather.
Look it up .
what is being Done here is a small amount of nano Aluminium at about 1 to 3 microns is being sprayed into the contrail , with the nano particles now mixing with the water vapor and you have what some would call a chemtrail. They don't dump it at the rate of fuel ,
Also its the combination of the water vapor with the particulate that blocks the sun, Its mostly water from the exhaust but then its spiked Now allowing the contrail to hang out for 4 hours . And no your not going to see spray nosisle or any of this shit , maybe back in 1995 you would have its now 2011 they make it look as normal as possible .
I estimate it would take ruffly 10 gallons or less to make a 300 mile trail if applied to the contrail properly
So could this be installed on a commercial air liner sure, could the valves be hooked up to gages to where it sprays only at serten altitudes ya. I don't really care how its being done because it shouldn't be done at all, it just needs to stop.