The next part of the group... Can someone help me?
First one may be a Ryan PT22 trainer, used for basic pilot instruction in WW2 by the USAAF and USN. Those flying today tend to be turned out in polished aluminum with yellow wings, the original colors of the trainers. Not long ago, Harrison Ford deadsticked a PT22 onto a golf course when it's engine quit.
Third one looks like an earlier Travel Air, maybe a model 4000, fitted with wing spotlights for air mail service. Travel Air was the original company of three light plane legends: Clyde Cessna, Walter Beech, and Lloyd Stearman.