u obviously do not know areonautical airflow.... air passing through engines and over wings do not make vortexual spins unless emmitted.... those jets do not pass fast enough through the air to cut it. most often it is slow what you see..... High pressure does not permit cloud cover if even rarely. so i'm gonna have to call bs on your claim of being in MA and not knowing the difference especially when we are surrounded by 3 major airports, bradely intl, chicopee afb, logan int'l.