World&apos;s second largest land-plane goes to Caribbean. The B-15, huge experimental bomber built several years before the B-19, arrives in Panama for uses not disclosed by Air Force Headquarters. This plane is exceeded in size among American Aircraft only by the B-19 and the &quot;Mars&quot;, the latter being the giant flying boat designed by Glenn Martin Company. A six-man crew flew the big ship from a base in the States to her new home in the tropics, where her arrival was the occasion of much public speculation, with most people believing her to be the more famous B-19. (49509 A.C.) 