Denver's aviation history moves from Stapleton - a mail-and-early-passenger field that became a major hub but was physically constrained - to the politically driven creation of Denver International Airport (DIA). A mayoral campaign promise and subsequent city commitments led to annexing 48.3 square miles and building a megaproject begun in 1990 with an initial $3 billion budget that swelled to nearly $5 billion. Construction proceeded without firm airline tenants, giving carriers, especially United, outsized leverage late in design; United demanded sub-35-minute turnarounds and rapid gate-to-gate transfers, forcing costly post hoc changes to partially completed underground systems and terminals spaced roughly 0.5, 1.0, and 1.5 km from the ticketing hall.
That operational ambition drove unconventional solutions: widely separated terminals linked by an $84 million automated people-mover (26 vehicles, 90‑second stops) and an unprecedented automated baggage-handling plan intended to move transfer bags in under ten minutes and deliver luggage before many passengers. The scale and novelty of the underground systems produced technical failures, legal and financial chaos, and public paranoia - fueled by the "New World Airport Commission" name and unsettling public art - yet the subterranean spaces mainly housed municipal logistics, chiefly the massive baggage infrastructure that proved far more mundane than the conspiracy lore suggested.
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