David Broadfoot since thee original discussion was about air travel I stand by my original statement you will not get on a plane without a passport or be allowed to fly to most countries if your passport doesn't have 6 months until it expires
David Broadfoot A passport is required for all international travel. If you're traveling anywhere overseas, you need a passport to board an international flight and to enter the country. Passport cards will not be accepted as form of I.D. for international air travel. Passports must be: Valid for at least 6 months after the date you enter a foreign country. Kept in good condition, free of any damage beyond normal wear and tear, and material alterations. You may be denied boarding if you travel with a passport that appears damaged or altered.