Jerryli,took a photo recently,of a T-6 in Florida,when I saw it I recalled taking a similiar PIC in the 80's at Flushing Airport in NYC,thought that might be the same aircraft,but no.
Speeds,was a local company that did air advertising and sky writing for years in the NYCity area,evenyually the actual writing became a series of dashes of smoke,hence the new name of Skytyping. Thanks Jerry, Steve B.