Surely you're not suggesting he hired a personal injury specialist law firm _before_ he bought his ticket and got on that plane?
Someone else _offered to get off this plane - for a few hundred or so bucks more than the on-site middle management was prepared to pay - so they chose to not only break his contract illegally, but physically assaulted him using hired goons to do so.
I'd bet reasonable money that Stephen Golan's people contacted Dao, and by "hired" they mean "The law form has offered to do this on a _very_ small commission, because they know just how much money United stands to lose here, and Stephen Golan plans on buying his own 747 with his 15% cut of the settlement figure".
And as much as I hate ambulance chasers - I'm cheering this one on here.
It's _possible_ I'll get o a United plane in future, but that'll require me knowing that this incident hurt them a lot - enough to ensure that nobody working at United now or in the future doesn't hear about it, and that it's blindingly obvious being part of letting a situation like this happen again will not only be an immediate firing offense, but also have United's lawyers chasing illegally acting staff for whatever they own to cover then next 8 figure damage payout.
For better or worse - this is how the justice system works against corporations - they can't choose to assault a person and put them in hospital - then just say "Oh sorry, here we'll cover your hospital bill. Now we're all good, right?" and have everybody involved just say "Company policy, soz!". Stephen Golan needs to take enough money out of United's coffers to guarantee that there's a top down message send inside United that this must _never ever_ happen again - no matter what the company policy says. (I'd also settle for United just covering Dao's expenses, and the entire chain of management from CEO down including the airport rent-a-cops as well being sentenced to whatever jail time they'd d=face if they're each personally committed this assault on Dao in public. But I'd be prepared to let Dao choose which of those outcomes he'd prefer...)