Most major airlines in 2026 allow you to transfer air miles to family members, but the "cost" of doing so varies wildly depending on the carrier's specific loyalty program. Programs like Air Canada’s Aeroplan and British Airways Executive Club (via Household Accounts) are leaders in "Family Sharing," allowing up to 8 family members to pool their points into a single shared balance for free. However, many U.S.-based carriers like Delta, United, and American Airlines charge a significant fee to transfer miles between individual accounts—often around $0.01 per mile plus a processing fee. In these cases, it is almost always more cost-effective to simply use your miles to book a ticket in the family member's name directly from your own account, which is free. Some premium credit cards also allow you to transfer "flexible points" (like Chase Ultimate Rewards or Amex Membership Rewards) to a family member's frequent flyer account, provided they are an authorized user on your credit card account, offering another loophole for consolidating travel rewards.