Sixty-seven miles. Los Angeles to San Diego. A drive most people make without thinking twice. United Airlines is launching that flight commercially in 2026 — one of ten new routes under 100 miles it's adding to its network. On the surface, it looks like an economics problem that doesn't add up. Look closer, and it's actually a hub strategy problem that adds up perfectly. **The flight is not the product. The connection is.** Ultra-short segments exist almost entirely to feed long-haul revenue at the hub. The ticket price on a 67-mile hop is never meant to cover its own costs — it's cross-subsidizing the yield on the transatlantic or transcontinental itinerary attached to the back end. Revenue management teams don't price these segments in isolation. They price the full itinerary, then back-allocate enough to justify the regional departure. The operational math, though, is genuinely brutal. At 67 miles, block time runs roughly 30 to 40 minutes. Boarding and turnaround consume more clock time than the flight itself. Worse, a regional jet on a sub-100-mile stage never reaches cruise altitude long enough to matter — the entire flight profile is climb and descent. Fuel burn per seat-mile spikes accordingly, because the efficient cruise phase that makes flying economical simply never arrives. United's regional fleet — ERJ-175s and CRJ-550s operated by United Express partners — is already flying under scope clause constraints that limit mainline encroachment. These aircraft are most economically strained on very short stages, where fixed costs per departure hit hardest. **So why expand here?** Because United's ultra-short additions signal something specific: connection banks at certain hubs are thin, and feed traffic isn't materializing through existing surface or codeshare options. Each new sub-100-mile route is less a demand signal than a network gap marker. The 67-mile flight isn't irrational. It's a confession about what's missing 2,400 miles further down the itinerary.