Ben is correct, as usual... buttons with that emblem have previously appeared here in the What-Is-It? forum. Allow me to jog your memory. It is said to be a "commemorative" button, honoring American (hence the 13 stars) aviator Charles "Lucky" Lindberg's first-in-history solo flight across the Atlantic Ocean, in his airplane named "The Spirit Of St. Louis." So is the other button in the photo Ben posted, except that button's designer showed the airplane's wing mounted in the wrong location to be the real Spirit Of St. Louis... whose wing runs across the top its body, not under it.
For me, a major clue to this button's correct ID is the very distinctive looking pattern of wavelets in the ocean below the airplane.