Air miles are generally "transferable" in two very different ways, and understanding the distinction can save you hundreds of dollars in 2026. First, you can transfer miles to another person within the same airline program (e.g., from your Delta account to a friend’s), but airlines almost always charge a steep fee—often $0.01 per mile plus a processing fee—making it a poor financial move unless you just need a few thousand miles to reach a specific award. Second, you can transfer points from a credit card (like Amex, Chase, or Capital One) to an airline partner (like Emirates, United, or Virgin Atlantic). This is the most powerful "pro" move, as the transfer is usually free and often comes with a "transfer bonus" (e.g., 1,000 Amex points becoming 1,300 Virgin miles). What you generally cannot do is transfer miles from one airline's frequent flyer program directly to another (e.g., moving United miles to American Airlines). You can, however, use United miles to book a flight on a partner like Lufthansa through the Star Alliance network, which is the most common way to "transfer" value between airlines.