3 crafts that appeared from the west heading north moving in a way that was not like an airplane with a 4th craft followed after 10 min

It was a clear night over Reykjavik, I was looking out my hotel window looking at the horizon to see if I could catch the northern lights by chance. The first light came from the west- it was just a light like a bright clear twinkling light. It moved so rapidly left, right up and down. And suddenly 2 others joined it and they were aligned in a row of 3 moving in unison and then they just disappeared north. About 10 minutes later, another one appeared from the same direction. It moved the same way and disappeared in the northern direction. However again in the morning of 2/23/22 I saw the same object of light again at 5:45am. I tried to get my husband up to see it but it disappeared so quickly. We are not in a flight path from the airport. There were no other air crafts in the sky. The only difference is that the second time I saw the lone craft, it was very overcast and so it flew low. Both mornings the window was open and I didn’t hear anything like you would if a plane flew that low over head.