: Most tickets are bought online with credit/debit cards, though some services accept PayPal for added security.
: Sites like KAYAK search hundreds of airline sites simultaneously to find the cheapest deals. where to buy plane tickets
If you need physical paper to print your own tickets or if you are looking for professional ticket stock: : Standard : Most tickets are bought online with credit/debit
While physical "paper" tickets (vouchers/coupons) have largely been replaced by electronic tickets, you can still find specialized or use standard printer paper to have a physical copy of your booking. Where to Buy Paper for Tickets or a REAL ID-compliant driver's license.
: A valid passport, passport card, or a REAL ID-compliant driver's license.