Donald Trump grounded Boeing's (BA - Get Report) 737 MAX 8 and MAX 9 planes Wednesday afternoon. The U.S. followed aviation authorities worldwide in grounding the jets.

"The safety of the American people, all people, is our paramount concern," Trump said in a statement from the White House. "Any plane currently in the air will go to its destination and thereafter be grounded until further notice. Planes that are in the air will be grounded upon landing at their destination. Pilots will be notified. Airlines have been notified and have agreed with us."

Jim Cramer said that a lot of people want to say, "Okay, enough is enough." But, with Boeing BA, the problem is that there's an issue of what people don't know, he continued. 

Right now, Cramer believes that there are other--potentially better--opportunities away from Boeing. Investors can instead take a look at a stock such as Salesforce (CRM - Get Report) .

Cramer clarified that he doesn't mean that he's calling for the bottom of Boeing, just that it's "too hard to call."

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