Movie theater operator AMC Entertainment Holdings (NYSE:AMC) will report first-quarter financial results after the market closes on Wednesday, May 8. Here are the key earnings estimates, what analysts are saying and key items for investors to watch. Earnings Estimates: Analysts expect AMC to report first-quarter revenue of $871 million, according to data from Benzinga Pro. The company reported revenue of $954.4 million in last year’s first quarter. AMC has beaten revenue estimates from analysts in 11 straight quarters. The estimate of $871 million would mark the lowest quarterly revenue by AMC…