[lucrum]

I've noticed more activity in air traffic over my house lately (Norway), with some planes I can't make much sense from.

If I say I hear planes that sounds both like a propellerengine AND a jet engine at the same time, what would your response be? Can't say I ever heard those types of planes before, heard the first one last winter. Sadly I've never seen any of them, mostly occur on cloudy days.