This happened here last liberation remembrance day. Four planes in formation, it was like the voice of God, incredible what a sound. I didn't realize what it was at first so it scared the willies out of me and then I saw the silhouettes and immediately knew what was up. You just can't describe the sound of those engines 300 meters up right over your office.

Originally there was supposed to a 4 engined Lancaster as well but it wasn't deemed airworthy so that got postponed, even so, it was mighty impressive.