On 6 July, 2009, United Airlines opened at $3.31 and dipped to an intra-day low $3.07 (-7.25%) on 10 July, but that very day closed at $3.26 and traded as high as $6.00 (+81.27%) four weeks later on August 6.[20]

There it is, nearly instant profit

Once everyone forgot about it, I'm sure it went back to normal.

But it certainly did them no favours. The David Dao incident is another example of there definitely being bad publicity.