Are people keeping 6 feet of distance in the security lines?

As well or better than most larger gatherings

As most people... yes and no. Considerate people yes. A-oles.. nope

Some of these airlines have set up their queues to be six feet apart, but they're not readily enforcing it. That also applies with going through security.

You will be on the plane like sitting next to another passenger.i just flew home on United yesterday at 750 pm to sacramento and it was packed.you will be definitely closer to the 6 feet area in security lines but as close as touching elbows on your flight depending on your airline.

Not really

Unfortunately, no. There are signs everywhere but they have workers there that have them stand 6 feet or they announce over the intercom throughout the airport.

Not really, they have put the sign for social distancing but nobody really follows.