The Air Express (1937)

The simian trio are entrusted with delivering $1,000,000 worth of diamonds via their air express service. Seriously, what could go wrong? Oh, yeah, they also have a hungry ostrich aboard. Did I mention the ostrich? There's an ostrich.
According to @walterlantz.fa..., this was Meany, Miney & Moe's final cartoon in the series. "Walt Lantz" got a co-writer credit on this one!