I suspect that this is the likely answer here, since old telephone keypads did n... | Hacker News

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ateeqs on May 14, 2014 | parent | context | favorite | on: Passwords for JetBlue accounts cannot contain a Q ...

I suspect that this is the likely answer here, since old telephone keypads did not have Q and Z.

dredmorbius on May 14, 2014 [–]

And more recent keypads have assigned various characters (particularly Q & Z) inconsistently, as I've posted separately.

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