The eight- to 12-passenger Fokker was the aircraft of choice for many early airlines, both in Europe and the Americas and it dominated the American market in the late 1920s. However, the popularity of the Fokker quickly waned after the 1931 crash of a Transcontinental & Western Air Fokker F-10 , which resulted in the death of Notre Dame football coach Knute Rockne . The investigation revealed problems with the Fokker's plywood - laminate construction, resulted a temporary ban from commercial flights, more stringent maintenance requirements, and a shift to all-metal aircraft such as the similar Ford Trimotor and later Boeing 247 and Douglas DC-2 . 
After graduation, alumna members continue to support Tri Delta and stay active within the Greek community. This includes joining an alumna chapter, attending and hosting philanthropy events, donating to the Tri Delta Foundation's scholarships, contributing to The Trident, writing reference letters for potential new members, and volunteering. Alumna members who wish to stay connected or make a more direct contribution to a specific collegiate chapter may join its alumna advisory team. Members volunteering on an international level include members of the National Housing Corporation,  providing resources and managing Fraternity properties, and members of the Tri Delta Foundation,  raising, managing and awarding scholarships to collegiate members in dire financial need.