Spirit AeroSystems Holdings, Inc. SPR is set to report first-quarter 2021 results on May 5, before market open. In the last reported quarter, the company delivered a negative earnings surprise of 95.52%.In the trailing four quarters, the company came up with a negative earnings surprise of 30.99%, on average.Let's take a closer look at the factors influencing Spirit AeroSystems’ upcoming results.Factors to ConsiderSpirit AeroSystems' shipset deliveries might have once again tumbled in the first quarter, as both its major customers, Boeing BA and Airbus EADSY, have continued to struggle due to the drastic impacts of the coronavirus pandemic on commercial aerospace. Over the past few quarters, Spirit AeroSystems’ shipset production has been toward the lower end. This is evident as the company could only manage to produce 71 of them in 2020, way less than 619 produced a year earlier. We expect this trend to have continued and impacted its soon-to-be reported results.Moreover, the company's commercial deliveries on a whole are expected to have declined. Such dearth of deliveries is expected to have adversely impacted Spirit AeroSystems’ first-quarter top line.Notably, the Zacks Consensus Estimate for first-quarter revenues is pegged at $859 million, indicating a 20.2% plunge from the year-ago quarter’s reported figure.Over the past few quarters, Spirit AeroSystems has been incurring excess capacity costs, abnormal production costs related to COVID-19, restructuring expenses and other expenses related to the Boeing 787 and Airbus A350 programs. Since COVID-19 prevailed during the first quarter, this trend is likely to have weighed on the company’s bottom-line performance in the soon-to-be-reported quarter.The Zacks Consensus Estimate for Spirit AeroSystems’ first-quarter loss stands at 93 cents per share, suggesting a significant deterioration against a loss of 79 cents reported in the prior-year quarter.Earnings WhispersOur proven model does not conclusively predict an earnings beat for Spirit AeroSystems this time around. The combination of a positive Earnings ESP and a Zacks Rank #1 (Strong Buy), 2 (Buy) or 3 (Hold) increases the chances of an earnings beat. But this is not the case here.Earnings ESP: The company’s Earnings ESP is -2.33%. You can uncover the best stocks to buy or sell before they’re reported with our Earnings ESP Filter.Zacks Rank: Spirit AeroSystems currently carries a Zacks Rank #3. You can see the complete list of today’s Zacks #1 Rank stocks here.Spirit Aerosystems Holdings, Inc. Price and EPS Surprise Spirit Aerosystems Holdings, Inc. price-eps-surprise | Spirit Aerosystems Holdings, Inc. QuoteA Stock to ConsiderHere is a defense stock you may want to consider, as it has the right combination of elements to post an earnings beat in its upcoming release:Triumph Group, Inc. TGI has an Earnings ESP of +9.80% and a Zacks Rank #3.Breakout Biotech Stocks with Triple-Digit Profit PotentialThe biotech sector is projected to surge beyond $775 billion by 2024 as scientists develop treatments for thousands of diseases. They’re also finding ways to edit the human genome to literally erase our vulnerability to these diseases.Zacks has just released Century of Biology: 7 Biotech Stocks to Buy Right Now to help investors profit from 7 stocks poised for outperformance. Our recent biotech recommendations have produced gains of +50%, +83% and +164% in as little as 2 months. The stocks in this report could perform even better.See these 7 breakthrough stocks now>>Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report The Boeing Company (BA): Free Stock Analysis Report Triumph Group, Inc. (TGI): Free Stock Analysis Report Airbus Group (EADSY): Free Stock Analysis Report Spirit Aerosystems Holdings, Inc. (SPR): Free Stock Analysis Report To read this article on Zacks.com click here. Zacks Investment Research