Yesterday, the skies of Chicago’s suburbs were graced with an unusual sight as three Ospreys made their way across the horizon. Such a scene is a rarity in the heart of Chicago, yet one observant resident managed to record the moment as the pair of tiltrotor aircraft, each with a price tag of around $85 million, cruised by. The combined value of these aircraft in flight was an impressive $255 million.

These Ospreys, known for their hybrid ability to lift off like helicopters and cruise like planes, also have a distinctive auditory signature that likely led to their detection. The clip quickly made its way to Reddit, sparking discussions and questions about the purpose of their flight through Chicago’s airspace.

It turns out that the appearance of the Ospreys is linked to the state’s upcoming visit from President Joe Biden. Often, Osprey’s are used by the US military to transport VIPs such as government officials. Sometimes, they may even do trial runs days before to test the route.

This unexpected aerial display added a dash of excitement to the day for those who found themselves looking up at the right moment. Despite being fairly uncommon, Biden has visited Chicago before and used an Osprey as his mode of transport. So, if you look up in the coming days, you may see them once again.