Mile Index: Watching Award-Chart Devaluation

Field notes

Mile Index treats airline award charts as versioned data: it extracts chart cells, compares observations, and presents detected changes with the prior mileage beside the current figure. The homepage reports 1,571 extracted cells from 13 sources, with 924 cells in the ANA international table alone. Its route comparison normalizes one traveler’s round-trip cost across programs, while explicitly noting that mileage currencies differ. Historical records include three major reconstructed devaluations since 2023, with some dates marked as approximate.