Congratulations to Czech Airlines OK Plus frequent flyer program as it reaches its 10th anniversary.

The program, which offers a 2,000-mile enrollment bonus, has improved its earning levels recently, and now offers new members retroactive credits earned up to three months prior to joining.

As of April, the airline has increased the minimum mileage accrual from 500 miles to 1,000 miles for all international flights, including all flights on Czech’s partners.

And the partnerships keep coming: Accor Sofitel, Novotel and Mercure hotels, as well as Crowne Plaza hotels have partnered up as of April.

In addition, holders of Czech’s co-branded Visa and Diners Club cards are now able to earn 100 miles for every 1,000 CZK spent on Czech’s Duty Free airport stores in Prague.