Update: I recently completed 4 flights in Nordamerkia and the options did not reset (addons including Nordamerkia 1000). Now that I’ve switched to Australia (addons including Australia 827) the options were back to easy. 
Update: I recently completed 4 flights in Nordamerkia and the options did not reset (addons including Nordamerkia 1000). Now that I’ve switched to Australia (addons including Australia 827) the options were back to easy.