A short note on airline security

I'm taking a flight today and decided to double-check on ID requirements. I saw an interesting section on ID requirements for children aged 15-17 traveling alone:

• Driver's License

• Passport
• Credit card
• School ID
• Company ID
• Library card
• Birth Certificate
• Social Security card
• Organization ID (such as athletic club, etc.)
• Proof of auto insurance in passenger's name

As we've seen in Israel and elsewhere, terrorists can be below 18 years old.

How hard is it to forge a library card or student ID?