Revenue came from airmail William Lawrence Sr Omnibit 1-20-20 In the 1930s, 85 percent of domestic airline revenue came from airmail. Revenue came from airmail William Lawrence Sr Omnibit 1-20-20 Share this:PrintFacebookTwitterTelegramMeWeWhatsAppPinterestLinkedInParlerGabRedditEmailMorePocketTumblrLike this:Like Loading... Related