Anyone EVER See Chem- OR Con-trails WHILE Flying?!

I'm curious, after flying back to Detroit from San Diego yesterday...if ANYONE has ever seen chem- and/or contrails being produced while they were flying.



The lingering trails that many feel are CHEMtrails do seem to arrive after many commercial flights are done for the day...and since all these flights are publicly reported so we should be able to discern legal from illegal (or military, not too far from illegal in most cases, ahem) air activity.



Cheers from sunny and muggy Detroit!
John