Gothenburg, Sweden is a new route for Czech Airlines and through Dec. 31, 2014, Czech OK Plus members can get double miles when flying between Prague and Gothenburg or between Hamburg and Gothenburg. You must book your flight by Nov. 30, 2014. The double miles are available for purchased flights in Economy Standard, Economy Plus, Economy Flex or business class. You must register for the offer before you purchase your ticket.

Another double miles bonus offer, which has been extended through Dec. 31, 2014, includes flights between Prague and Brussels, Bucharest, Moscow or Warsaw. You must book these flights by Nov. 30, 2014 as well and purchase in the same fare categories listed above. You must register for the promotion before you purchase your ticket. Visit http://insideflyerus.wpengine.com/link/?11770 to learn more about both offers.