It is possible to redeem Royal Plus miles for Royal Jordanian flights and any of its oneworld partners. You can also redeem your miles for a free class upgrade. Also it is possible to use miles for extra luggage allowance. Keep in mind that there may be some restrictions and limitations. If you need a credit card that can be used for any airline flight, consider applying for a travel rewards credit card. You can find there credit cards that allow you to use earned miles or points anytime, with no blackout dates.
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All rates and fees, and other terms and conditions of the products mentioned in this article/post are actual as of the last update date but are subject to change. See the current products' Terms & Conditions on the issuing banks' websites.