 Instead of being leather-jacketed, silk-scarved airmail pilots, the crews of the "Clippers" wore naval-style uniforms and adopted a set procession when boarding the aircraft.While waiting at Foynes, County Limerick, Ireland for a Pan Am Clipper flight to New York in 1942, passengers were served a drink today known as Irish coffee by Chef Joe Sheridan.During World War II most Clippers were pressed into military service.