Along the lines of what PA Slammer posted.
I see a lot of ways to handle getting these folks in to Indoc and beyond at a relatively low cost to the company.

"Two weeks notice" is somewhat of a standard. Not required... I get it. And "two weeks notice" goes both ways, in my opinion. No need to remind me that "it's business, and a lot of us have been furloughed more than once...". I realize that.

Yes, bringing them in now incurs some potential costs. But these people left their previous jobs in good faith... some of them in just the last few weeks. The company could have earned a lot of loyalty with these 30 people by doing the right thing. United should have honored their commitment to start them on 3 March. It is a blown opportunity.