The "release, patch, path" thing you are quoting that is used by modern technology companies was *literally* invented by Toyota. "Continuous improvement" is one of principles of https://en.wikipedia.org/wiki/...

Gmail works fine with folders. You can set up Thunderbird with Gmail's IMAP and then drag/drop your Yahoo folders onto it to migrate all your old mail.

Paying with cash is a sure way to attract more attention to yourself, not less. Don't be silly, government is not after you.

Additionally, most credit cards provide with additional lost luggage and life insurance when you use them to buy your ticket.