Originally Posted by flyerCO

If obviously joking, no. Unlike a bomb, there's technically nothing illegal about being onboard (domestically anyway) with Covid. Also there's no risk of immediate harm. Plus lying about having Covid isn't illegal. Stating you have a bomb, even if you don't is illegal.

At best (and only if it can be shown they knew when boarding and thus lied during self certification) they can be denied further travel by DL.

In very poor taste, but not everyone has good sense.

Now if they lied about having CV19 and then started coughing on you, you could make terroristic threat case. Context would matter greatly and there would need be no way it was considered a "joke."