How ETOPS and High-Bypass Turbofans Ended the Four-Engine Passenger Airliner
From the 60-minute rule of 1953 to ETOPS-370 on the Airbus A350: how twinjet turbine reliability retired the 747 and A340.
Aviation Blog & Analysis
Historical investigations, code tracking, and airline corporate lineages written from primary aviation registry datasets.
Inside Offshore Aircraft Registries: Why Thousands of Airliners Carry Irish and Bermudian Tail Numbers
Why airlines in Asia, Europe, and Latin America fly commercial jets registered in Ireland (EI-), Bermuda (VP-B), and the Cayman Islands (VP-C).
Why Ten Airlines Fly the Exact Same Corridor: Inside Contested Routes and Fifth-Freedom Battles
Why certain global airport pairs attract up to a dozen competing airlines while other major cities have zero non-stop service.
Why So Many Airlines Start with Aero
Over 200 airlines in civil aviation registries share the Aero prefix. The history of classical Greek roots in aviation branding.
How Airline Codes Get Recycled After Carriers Die
With only 676 two-letter combinations, IATA codes face constant turnover. How expired airline identifiers get reassigned.
The Oldest Airlines Still Flying and What Kept Them Alive
KLM, Avianca, and Qantas crossed the century mark in aviation. How early state ties and strategic isolation prevented early collapse.
What Defunct Really Means in Airline History
Bankruptcy, liquidation, absorption, and regulatory shutdowns. Exploring the distinct fates grouped under defunct status.