NEW YORK (TheStreet) -- Spirit AeroSystems Holdings (SPR) - Get Report 2015 earnings estimates were increased to $4.05 from $3.85 per share at Jefferies, with 2016 earnings estimates raised to $4.30 from $4.15 per share.

The firm maintained its "buy" rating and $66 price target on the stock.

Yesterday, Spirit AeroSystems announced its 2015 second quarter financial results with earnings of $1.11 per share on revenue of $1.7 billion. This compares to earnings of $1.01 per share on revenue of $1.8 billion for the same period one year ago.

Excluding items, Spirit earned $1.09 per share, handily beating the average analyst estimate of 97 cents, according to Thomson Reuters.

"Although there could be some pressure on margins in the second half of the year driven by higher 787 and A350 deliveries, the core business continues to show improvement," Jefferies analysts said.

Spirit AeroSystems is taking steps to cut unit costs by continuing to produce A350 shipsets through the Airbus August shutdown, which avoids disruption and overhead absorption issues, drives some savings on transportation costs, Jefferies added.

Spirit AeroSystems, based in Wichita, KS, is an independent non-original equipment manufacturer (OEM) aircraft parts designer and manufacturer of commercial aero structures.

Shares of Spirit AeroSystems are rising 0.04% to $55.87 in afternoon trading on Thursday.

Separately, TheStreet Ratings team rates SPIRIT AEROSYSTEMS HOLDINGS as a Buy with a ratings score of B+. TheStreet Ratings Team has this to say about their recommendation:

"We rate SPIRIT AEROSYSTEMS HOLDINGS (SPR) a BUY. This is driven by several positive factors, which we believe should have a greater impact than any weaknesses, and should give investors a better performance opportunity than most stocks we cover. The company's strengths can be seen in multiple areas, such as its solid stock price performance, impressive record of earnings per share growth, compelling growth in net income, revenue growth and largely solid financial position with reasonable debt levels by most measures. We feel its strengths outweigh the fact that the company shows low profit margins."

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