Note how the green line broke to the downside, then retested before heading lower in a cascade of "Range Expansion" Declines.
Once those Range Expansions took a toll on the price of UAL shares, the price was able to rebound, and rebound they did right back to the KEY HIDDEN LEVEL.
If you don't have these powerful tools at your disposal, then you are missing out.
As for UAL down at these levels: I'd say it is a buy down here, but only after a total of 3 down days, which means at the close on Tuesday.