Can you change frequent flyer number after check in?
If you have the booking code and your name, you should be able to sign into view the reservation and add the frequent flyer number. You can also have it added at check-in (online or in person) and sometimes even after the flight.
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To add your loyalty number, log in with your booking code and surname on 'My Trip' (klmf.ly/1zyczoB) after booking your ticket and click on the 'passenger details' tab. A button will appear with the words 'Add frequent flyer number'. >>>
Or you even forgot to add the number. Both things are not a problem, as all frequent flyer programs allow crediting miles retroactively. Depending on the program, you can credit the miles up to 12 months after the flight. Most programs, however, only allow this up to 6 months.
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.
In principle, these could vary at the level of each individual flight. In practice, when booking through an airline's website you'll simply be prompted for a single frequent flyer number, with the following effects: It will apply to all flights on the PNR. It will apply for both mileage earning and determining status.
You can join multiple member airline frequent flyer programmes if you wish, but they are each managed separately, so you cannot transfer miles or points between them or combine them into one.
Miles and points earned on co-branded hotel and airline travel rewards cards do expire usually if you are not active in redeeming them for 12 to 24 months, depending on the terms of the hotel or airline loyalty program.
SkyMiles is more than just a frequent flyer program, it is a loyalty program. With SkyMiles partners, get closer to your next adventure by earning miles with the everyday products and services you enjoy. Earn miles on dining out, overnight stays, rideshares, shopping sprees and more with the brands you love.