I don't know why everyone is so quick to label these other objects as balloons.
A CNN correspondent [0] just claimed that there were conflicting statements from the pilots that it interfered with their sensors as they approached it. And that they couldn't figure out how it was staying in the air. I have no idea where she got those updates, but it certainly adds mystery to the situation.
The government is apparently not saying what these objects were, so people are assuming they're balloons.