// editorial field notes

ABT Case Studies

Current events examined through The Airport Bathroom Test: what happened, what the evidence can support, where the correction gap may lie, and what leaders should ask next.

ABT Case Study // 01

When the backup isn’t a backup

Infrastructure & resilience

A communications outage at Philadelphia follows a documented upgrade programme. The ABT question: what did the correction cover, what was tested, and is that evidence still current?

Incident : 21 September 2026

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