>>5568064 (pbn #7120) Dig on the braille on the plaque at Denver Airport
I think it's just a typo.
Looking at the pics you compiled, it's kind of understandable for a typeset for a '0' and '9' can be confused.
However, I'm not too sure about the '1' and '4'
Vid related, jump to 2 minutes in…
It becomes more clear, in the disarray of a typesetting shop, a mistake like that could be made.
Maybe by an apprentice?
They caught the mistake?
Said 'Fuck it, who's gonna check?'
Roll with it.
https://youtu.be/_o3ruXbQ6wA