This seems a plausible optimistic hypothesis for BA, a retracement to its longer-term support.
A consensus explanation for why BA is crashing isn't clear to me, other than fears of a trade war. But some are skeptical of that explanation. A simpler explanation is, look at the strong parabolic movement starting on Jan 4, 2018, the same movement seen across the market. Its magnitude of trend-deviation cries out for a retracement to trend. Right at the new year an exuberance of optimism raised prices across the market, so BA's drop may be a retracement to prior optimism hastened by fears of a trade war, etc.
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We can see similar shark-fin upward-parabolic surges (micro-bubbles) followed by retracements back to long-term support...
Bulls keep trying to smash through even the yielding resistance along a bull-run slope, but bears keep pounding them back to trend, and on and on...