President Trump on March 27 signed into law the $2 trillion stimulus package designed to save millions of jobs and bail out companies devastated by the coronavirus. But when the dust settled, one hard-hit sector of the travel industry was left on the sidelines: the major cruise lines.

Even politicians who demanded that the industry clean up its environmental record as a condition for receiving taxpayer funds were a little stunned by the news.

“I have to admit I was surprised,” Senator Richard Blumenthal, Democrat of Connecticut, said in an interview, “given the president’s support for the cruise industry.”

So why were the major cruise lines left out? These are the three primary reasons.

They’re foreign corporations

In the weeks before the bill’s passage both Democrats and Republicans expressed reservations about bailing out the major cruise lines because they are not American corporations and are largely exempt from paying income taxes.