While this cartoon isn't nearly the quality of a Disney cartoon from the era, Ub Iwerks had nothing to be ashamed of with this pleasant little cartoon. Ub used to be the lead animator of Disney Studios in the early days, but in the 1930s he seized an opportunity to do his own films-- with only fair results. In fact, by the end of the decade, Iwerks would return to Disney because his own independent efforts had failed.
Of the various cartoons Iwerks did, his Willie Whopper series, though short-lived, was better than most. The formula was about the same in each--Willie regaled folks with impossible stories of his supposed conquests. In "The Air Race", Willie tells the kids about an air race he supposedly was in--and there was an awful lot of cheating going on in this one! The provided for a lot of cute vignettes, an inside joke about 'Iwerks' and a prize bestowed upon Willie by none other than Amelia Earhart herself! There are no huge laughs but lots of little ones and LOTS of action. Worth seeing.
By the way, my score of 7 is relative to other cartoons of this era. The quality of cartoon shorts would improve dramatically in the next decade and this one isn't even close to them in quality.