Air France allows it on some routes jointly operated with a codeshare partner.

Examples:
- CDG-NGO (all flights are codeshares operated by JL)
- CDG-VIE (some flights are codeshares operated by OS)
- CDG-BUD (some flights are codeshares operated by MA)

You can redeem your miles from any FF program that allows awards on Air France on these flights, since AF is making the respective award seats available out of their own codeshare allotment.


Which, generally speaking, is not the norm anymore. Most airlines require you to book an award on an other airline - operated flight using the carrier's code + flight number which is actually operating the flight.


So if you want to max out the redemption possibilities on a broad range of airlines, Alaska certainly is a very good (but also very unique) possibility.