Ummm, guys. Lets not get overly excited.
A tweet, even if from the President elect, does NOT cancel a contract. There are REAMS of laws on government contracts and what it takes to cancel a contract and who gets paid what when that happens.
No, but incentive to bring costs under control is always welcome.
All he needs to do is threaten to buy stock in Boeing and the MSM/Libs will be demanding all contracts with them be cancelled.