That's quite the hypothetical, and I don't advocate it. But they certainly don't have to be limited by extradition.
This is not something the board can do
Morally, ethically, legally questionable. But certainly not impossible.
I'm sure they'd just fire the executive(s) in question first. Lots cleaner and maybe cheaper depending on the golden parachute in the executive's back pocket.
What I think is more likely to happen (but still unlikely) is that Boeing is penalized through corporate liability. The aggregation of the executives' actions create a responsibility for Boeing, although no single person's actions meet any criminal action. In that case the USA would fine Boeing or punish it in some other way, but I don't think that money is going to Ethiopia or Indonesia.
Lastly, since we don't have extradition agreements with either of those countries these arguments would probably not even come up, as we'd tell their embassy to go pound sand- we're not handing over American citizens until you reciprocate with us, prove that your courts are not kangaroo courts, and sign an extradition agreement. And there's no way we're signing one- you think the Trump administration is going to sign an extradition agreement with either of those countries? No, these guys are going to skate.
Some references, they probably don't hit everything but they are a good start:
https://www.justice.gov/jm/criminal-resource-manual-612-role...
https://www.justice.gov/jm/criminal-resource-manual-603-dete...
https://criminal.findlaw.com/criminal-procedure/extradition....
Worse, because of the corporate shield, any malefactors get to keep their ill-gotten gains. (Wells Fargo's execs, even after clawbacks, wound up tens of millions of dollars ahead.) There's no serious deterrent -- the system encourages wrongdoing at the individual level, the perpetuation of entities where wrongdoing occurs, and the creation of new entities where wrongdoing will commence.
Prediction: everyone at Boeing will come in for a safe landing after a bit of turbulence.
Agree with rest, organized deniability is pretty much how large orgs are set up.
2) find the people who allowed the Max to keep flying after the first wreck. Not literally one hour later, but once they had information that MCAS might have been involved, a crime was committed (endangering public safety) allowing flights after that moment.
3) If any whistle-blowers emailed their superiors about MCAS failures, whoever ignored the complaint committed a crime unless any written concerns were properly documented, filed, considered, etc.
Let's recertify our jet instead of doing a new one, shorten time to market.
New engines don't fit, ruin the handling of the aircraft. Can't recert that.
Try to fix aircraft handling in software. Designed flawed system to hide this from pilots and get regulatory apptoval. Under testing discover that system as submitted to regulators does not work well enough in flight. Update to allow to run repeatedly instead of once as well as increasing movement ranger per cycle. Do not tell regulators.
Ship aircraft with 1 hour iPad video intro for pilots. Do not mention this system.
Discover that the indicator in the cockpit for sensor failure for the system only works if you have optional HUD upgrades. Sit on this data. Do not patch until your aircraft is grounded.
Reassign the guys who are supposed to be doing safety oversight for you if they ask for more safety testing.
There still in business though, so Boeing will probably pull out of this fine.
Boeing itself should be fine after a couple of really expensive years. VW was as well and I for my part really thought VW could go under. Instead it hit some high level managers and around 30 billion in fines.