Catch up on today's top five analyst upgrades with this list compiled by The Fly: 1. Alere (ALR) upgraded to Outperform at Leerink by analyst Dan Leonard on expectations that Abbott (ABT) will consummate its proposed acquisition at $56 per share. 2. American Airlines (AAL) upgraded to Overweight at Morgan Stanley with analyst Rajeev Lalwani saying American continues to have the best revenue story in the industry with opportunities that include yield management, credit card initiatives, cabin segmentation, and merger synergies. He also said that its fleet reinvestment cycle is maturing and should result in free cash flow yields in the mid-teens over the coming years. 3. ManTech (MANT) upgraded to Neutral at Credit Suisse by analyst Robert Spingarn, who said positive organic growth returned in Q1. 4. Rosenblatt upgraded U.S. Steel (X) to Buy and Reliance Steel (RS) to Neutral. 5. L Brands (LB) upgraded to Outperform at Bernstein. This list is just a portion of The Fly's full analyst coverage. To see The Fly's full Street Research coverage,
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