Frontier A Two-Horse Race Again: Denver’s seemingly sudden air service slowdown masks some key underlying strengths Share WhatsApp LinkedIn X Facebook Email Frontier A Two-Horse Race Again: Denver’s seemingly sudden air service slowdown masks some key underlying strengths May 2015 3 min read Seth Kaplan Subscribe Already a subscriber? Login Issue Overview Back in 2009, an awful year for U.S. airlines and airports, every major airport lost airline seats. But one—Denver, with less than a 1% decline—lost less service than any other.