AECOM, Gensler, Corgan, PGAL, HOK, HNTB, Stantec, and Gresham Smith top Building Design+Construction's ranking of the nation's largest airport terminal and airport facility sector architecture and architecture/engineering (AE) firms for 2026, as reported in BD+C's 2026 Giants 400 Report.

For more airport facility rankings, check out: 
• Top 80 Airport Terminal Engineering and EA Firms 
• Top 75 Airport Terminal Contractors and CM Firms

Source: Building Design+Construction's 2026 Giants 400 Report.