TheStreet's Jim Cramer says he's keeping an eye on FedEx Wednesday because the company doesn't just give you its numbers, it gives you a worldwide overview where you really get a great read on what's strong in the U.S. and what's strong overseas. He says FedEx is a very well-run company and what he'll be looking for in its quarterly results is that domestic shipments by truck have been growing because that will show that there's more strength in the economy. He points out that February was a very weak month in this country and so they may comment on that too. Cramer considers FedEx a buy and says the company has consistently delivered unlike UPS.