After removing First Class from flights between Munich and Denver on December 2, 2016, Lufthansa is set to bring back their best cabin to the Rocky Mountain destination.
Beginning on May 1, Lufthansa brings back the A346 on the route which allows for First to be back on the timetable. Lufthansa currently flies the A333 on the route which does not offer First Class. Expect this to be in place through at least the Summer timetable.
It would be no surprise if the A350 begins to serve Denver later this year which would once again eliminate First Class since the A350 is not equipped with the ‘F’ cabin.