Logistics and transportation giant FedEx Corporation FDX could provide a snapshot of the sector’s performance when it reports fourth-quarter financial results after the market closes on Tuesday.Here's a look at the earnings estimates, what experts are saying ahead of the report, and key items to watch.Earnings Estimates: Analysts expect FedEx to report fourth-quarter revenue of $21.84 billion, down from$22.1 billion in last year's fourth quarter, according to data from Benzinga Pro.The company has beaten a ...