In 2026, while your wife cannot directly "spend" miles from your personal account using her own login, you can easily use your miles to book a flight in her name. Most major airlines, including Delta, United, and American, allow you to designate anyone as the passenger when redeeming your miles for an award ticket. Alternatively, many programs offer "Points Pooling" or "Family Sharing" (popular with JetBlue, Emirates, and British Airways) which allows family members to combine their balances into one pot. If your airline doesn't offer pooling, you can physically transfer miles to her account, though this is generally discouraged by travel experts because airlines often charge a steep fee (typically 1 to 1.5 cents per mile) plus a processing fee, which can often negate the value of the miles themselves.