Last week's profit announcement from BOC Aviation Limited (HKG:2588) was underwhelming for investors, despite headline numbers being robust. We think that the market might be paying attention to some underlying factors that they find to be concerning.

The Power Of Non-Operating Revenue

Most companies divide classify their revenue as either 'operating revenue', which comes from normal operations, and other revenue, which could include government grants, for example. Oftentimes, non-operating revenue spikes are not repeated, so it makes sense to be cautious where non-operating revenue has made a very large contribution to total profit. Importantly, the non-operating revenue often comes without associated ongoing costs, so it can boost profit by letting it fall straight to the bottom line, making the operating business seem better than it really is. It's worth noting that BOC Aviation saw a big increase in non-operating revenue over the last year. In fact, our data indicates that non-operating revenue increased from US$123.4m to US$226.9m. If that non-operating revenue fails to manifest in the current year, then there's a real risk the bottom line profit result will be impacted negatively. Sometimes, you can get a better idea of the underlying earnings potential of a company by excluding unusual boosts to non-operating revenue.

That might leave you wondering what analysts are forecasting in terms of future profitability. Luckily, you can click here to see an interactive graph depicting future profitability, based on their estimates.

The Impact Of Unusual Items On Profit

Alongside that spike in non-operating revenue, it's also important to note that BOC Aviation'sprofit was boosted by unusual items worth US$284m in the last twelve months. We can't deny that higher profits generally leave us optimistic, but we'd prefer it if the profit were to be sustainable. When we analysed the vast majority of listed companies worldwide, we found that significant unusual items are often not repeated. And that's as you'd expect, given these boosts are described as 'unusual'. If BOC Aviation doesn't see that contribution repeat, then all else being equal we'd expect its profit to drop over the current year.

Our Take On BOC Aviation's Profit Performance

In the last year BOC Aviation's non-operating revenue really gave it a boost, but not in a way that is necessarily going to be sustained. And on top of that, it also saw an unusual item boost its profit, suggesting that next year might see a lower profit number, if these events are not repeated and everything else is equal. For the reasons mentioned above, we think that a perfunctory glance at BOC Aviation's statutory profits might make it look better than it really is on an underlying level. Keep in mind, when it comes to analysing a stock it's worth noting the risks involved. For example, BOC Aviation has 4 warning signs (and 2 which make us uncomfortable) we think you should know about.

Our examination of BOC Aviation has focussed on certain factors that can make its earnings look better than they are. And, on that basis, we are somewhat skeptical. But there are plenty of other ways to inform your opinion of a company. For example, many people consider a high return on equity as an indication of favorable business economics, while others like to 'follow the money' and search out stocks that insiders are buying. So you may wish to see this free collection of companies boasting high return on equity, or this list of stocks with high insider ownership.

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.