Can someone else use your frequent flyer number? Absolutely not, because your number is unique to you. They can't make a reservation with your number because the name will not match the number in the airlines records.

No, you cannot use your frequent flyer number to earn miles or points on a ticket that has someone else's name on it. Airline loyalty programs are strictly personal; the name on the frequent flyer account must match the name on the government-issued ID of the passenger flying. If you try to enter your number for a friend's flight, the system will usually reject it or the miles simply won't be credited. However, you can use your accrued miles to book an award ticket for someone else—in this scenario, you are the "buyer" and they are the "passenger." If you want to help a family member earn points, some airlines (like JetBlue, British Airways, or Qantas) offer "Family Pools" or "Household Accounts" where multiple people can link their accounts to share a single pot of miles, but the individual flights must still be flown by the specific account holder.

No, you cannot use your frequent flyer number for someone else. Frequent flyer programs are typically tied to an individual’s account and are non-transferable. Here’s why:

1. Personalized Benefits: Frequent flyer accounts are designed to track the travel activity of a specific person. Using your number for someone else would inaccurately reflect your travel history and could lead to issues with earning or redeeming miles.

2. Fraud Prevention: Airlines have strict policies to prevent misuse of frequent flyer accounts. Sharing your number with someone else could be considered fraudulent activity and may result in penalties, including the suspension or closure of your account.

3. Eligibility for Rewards: Benefits like upgrades, lounge access, and bonus miles are often tied to the account holder’s status or eligibility. These perks cannot be transferred to another person.

However, there are a few exceptions or alternatives:

• Family Accounts: Some airlines allow you to pool miles with family members through specific programs.
• Gifting Miles: You can often transfer or gift miles to someone else, though this may involve fees or restrictions.
• Booking for Others: You can use your miles to book a flight for someone else, as long as you’re the one making the reservation.

Always check with your airline’s frequent flyer program for specific rules and policies.