This document summarizes a working paper about the competition between Airbus and Boeing to develop very large aircraft (VLAs), specifically a superjumbo plane seating over 500 passengers. The paper analyzes why Airbus, not Boeing, committed to developing the A380 superjumbo, and why Boeing's efforts to develop a smaller "stretch jumbo" failed. It uses game theory concepts and considers various evidence from financial analyses, product market data, capital market reactions, and the companies' organizational structures to explain the outcome in terms of strategic interactions between the competitors.