I had a airborne swarm come in, about 8:50 in the morning, A couple weeks ago while cutting the lawn. I drove right into the middle of them in hopes of dropping them on a close branch. That wasn't working, so I ran in to get the chainsaw; they just wouldn't drop. ( First time in 40 years, I couldn't make a swarm lite on a limb.) They headed west into the neighbors property. It's like watching a 100 dollar bill fly away
Another swarm,in the picture, took up residency in an undesirable spot.