On May 10 2026, AirIndex's score for Phoenix moved from 50 to 65 — a 15-point intra-tier acceleration anchored to two simultaneous Arizona legislative signals: SB1819 passing Senate consent calendar (vertiport zoning) and SB1457 advancing on a Do Pass recommendation (air mobility fund). Tier transitions are the predictive layer's headline events, but intra-tier movement is structurally distinct: it reads the price of acceleration within a regulatory regime, not the boundary crossing into a new one. The Phoenix case is the cleanest worked example to date of the methodology detecting compound legislative signal density inside a single capture window. This piece traces the structural read against platform data and logs a forward call on the next Arizona-AAM signal.
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