Rare Jets: The Boeing 757-300, 767-400ER, and Airbus A318
The aviation industry has seen its fair share of rare and unique aircraft over the years. Among them are the Boeing 757-300, Boeing 767-400ER, and Airbus A318, which were designed to fill specific niches in the market but ultimately failed to gain widespread adoption.
The Boeing 757-300, for example, was a stretched version of the standard 757-200, measuring 178 feet 7 inches from nose to tail. It was built with reinforced wings, landing gear, and center fuselage to accommodate up to 295 seats. Despite its strong unit economics on dense corridors, the operator base for the 757-300 has shrunk rapidly, leaving only two commercial carriers operating the type in scheduled service worldwide: United Airlines and Delta Air Lines.
The Boeing 767-400ER was designed to solve a niche fleet replacement problem for Delta Air Lines and Continental Airlines. It featured aerodynamic raked wingtips that expanded its wingspan and provided improved fuel efficiency. However, its small production run of just 38 airframes sealed its long-term fate as a stopgap solution.
The Airbus A318, on the other hand, was the smallest member of the single-aisle Airbus A320 family, measuring 103 feet 2 inches in length. It was built with a heavy wing structure and main landing gear, which made it less fuel-efficient compared to purpose-built regional jets.