What happened Airline supply chain management company Wesco Aircraft Holdings' (NYSE: WAIR) stock took its shareholders for a roller-coaster ride this morning, falling as much is 21% in early trading before bouncing back to book an 11% loss as of noon EST. The reason, as you might have guessed, is earnings. Wesco reported its fiscal fourth-quarter and full-year 2017 earnings after close of trading last night, and this morning was investors' first chance to trade on the news. Analysts had expected Wesco to report pro forma profits of $0.16 per diluted share. Instead, Wesco reported a $0.39 per share GAAP loss for its fiscal fourth quarter and a pro forma profit of $0.08 per share. By either measure, therefore, Wesco "missed" earnings. Wesco stock is losing a lot of altitude today. Image source: Getty Images. So what The news for the full fiscal year was arguably worse. Wesco reported a loss of $2.40 per diluted share on revenues of $1.43 billion. Wall Street had been looking for a profit of $0.72 per diluted share (albeit, only pro forma) on sales of $1.46 billion. As a result of its full-year loss (and the stock slide that followed it), Wesco now sports a negative P/E ratio and a market capitalization of less than the $870 million in debt on its balance sheet. Now what Sales were down for the full fiscal year -- 3.2%. The good news is that Wesco hopes to return to sales growth in fiscal 2018, guiding investors to expect "a low single-digit percentage increase in net sales year-over-year in fiscal 2018." As far as profits go, management gave investors only an "adjusted EBITDA" projection -- a promise that could mean pretty much whatever management decides it will mean. For what it's worth, though, management says this very pro forma number will grow by "a low double-digit percentage" in fiscal 2018, with most of the growth occurring in the back half of the year. Judging from today's market reaction, it doesn't look like investors are very interested in sticking around to see if Wesco will deliver on that promise. 10 stocks we like better than Wesco Aircraft HoldingsWhen investing geniuses David and Tom Gardner have a stock tip, it can pay to listen. After all, the newsletter they have run for over a decade, Motley Fool Stock Advisor, has tripled the market.* David and Tom just revealed what they believe are the 10 best stocks for investors to buy right now... and Wesco Aircraft Holdings wasn't one of them! That's right -- they think these 10 stocks are even better buys. Click here to learn about these picks! *Stock Advisor returns as of November 6, 2017Rich Smith has no position in any of the stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. The Motley Fool has a disclosure policy.