From March-September 1930, Europa made her first nine trans-Atlantic voyages without a catapult installed. Beginning in July 1930, supplementary flights were made to the Europa, delivering mail to the ship. This mail could not be catapulted off the ship, and most were marked with a one-line advisory noting that the mail was not catapulted or had the airmail etiquette crossed out.

Mail from supplementary flights bears a red supplementary flight cachet.