US Airways-America West reservation system merger crash
US Airways' newly merged computer reservation system crashed for hours, stranding thousands of passengers, causing long lines and check-in failures nationwide right after the two airlines' systems were combined.
The damage was public. The root cause was preventable.
US Airways' newly merged computer reservation system crashed for hours, stranding thousands of passengers, causing long lines and check-in failures nationwide right after the two airlines' systems were combined.
What the software actually got wrong
The rushed migration to a single shared reservation platform following the US Airways-America West merger overwhelmed the new combined system's capacity and had not been adequately load-tested for the cutover weekend.
The rushed migration to a single shared reservation platform...
The rushed migration to a single shared reservation platform following the US Airways-America West merger overwhelmed the new combined system's capacity and had not been adequately load-tested for the cutover weekend.
Requs AI Edge Case flags this exact pattern at the requirements and architecture stage — before a single line of code implementing it exists — so the assumption behind it gets challenged while it is still cheap to fix.
Beyond code coverage and "shall" testing
Root causes like this one rarely show up in code coverage or requirements-compliance testing, because nobody wrote a requirement anticipating the specific edge case that broke. Requs AI Edge Case and Requs AI Software FMEA are built to surface exactly this class of overlooked failure mode — before the software is written.
Surfaces this before code exists
Identifies edge cases like this one at requirements and architecture time, using the Common Defect Enumeration to catalog failure patterns seen across hundreds of real-world software failures — including this one.
Connects the failure mode to the hazard
Traces this class of root cause directly to the system-level hazard it can produce, so a defect pattern like this one gets flagged during design review instead of after it ships.
Find the overlooked root causes before they ship.
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