Investors love stocks that consistently beat the Street without getting ahead of their fundamentals and risking a meltdown. The best stocks offer sustainable market-beating gains, with robust and improving financial metrics that support strong price growth. Does Republic Airways (NASDAQ: RJET) fit the bill? Let's take a look at what its recent results tell us about its potential for future gains.

What we're looking for
The graphs you're about to see tell Republic's story, and we'll be grading the quality of that story in several ways:

  • Growth: are profits, margins, and free cash flow all increasing?
  • Valuation: is share price growing in line with earnings per share?
  • Opportunities: is return on equity increasing while debt to equity declines?
  • Dividends: are dividends consistently growing in a sustainable way?

What the numbers tell you
Now, let's take a look at Republic's key statistics:

RJET Total Return Price Chart

RJET Total Return Price data by YCharts

Passing Criteria

3-Year* Change 

Grade

Revenue growth > 30%

42.8%

Pass

Improving profit margin

100.8%

Pass

Free cash flow growth > Net income growth

152.2% vs. 5,800%

Fail

Improving EPS

618.9%

Pass

Stock growth (+ 15%) < EPS growth

68.5% vs. 618.9%

Pass

Source: YCharts.
*Period begins at end of Q1 2010.

RJET Return on Equity Chart

RJET Return on Equity data by YCharts

Passing Criteria

3-Year* Change

Grade

Improving return on equity

5,820%

Pass

Declining debt to equity

(31.1%)

Pass

Source: YCharts.
*Period begins at end of Q1 2010.

How we got here and where we're going
Frontier Airlines parent Republic misses out on a perfect score primarily because profit started from a lower point (virtually zero) than did free cash flow. Today, it's not only one of the best-performing airline stocks of recent years, it's also one of the cheapest. Only US Airways (NYSE: LCC) has a lower single-digit P/E than the 8.8 Republic currently sports, and every other low-cost carrier is at least twice as pricey, if not three times as pricey. But does current cheapness translate into a long-term value, or are these backwards-looking metrics deceptive to forward-thinking investors?

It's been a bit over two months since my fellow Fool Sean Williams pointed out that Republic, despite its low price, was booking fewer passenger-miles in 2013 and could be set for a fall. Since then, Republic's shares have shed approximately 15% of their value. To counter the possibility of revenue declines, the airline joined Spirit Airlines (SAVE 6.46%) and Allegiant Travel (ALGT -0.82%) last month in charging a fee for carry-on baggage, which is more or less the final frontier of irritating airline charges, short of charging you for the oxygen should those masks drop down during an emergency.

The difference between Republic (or, more specifically, Frontier, as Republic Airways itself isn't implementing the policy) and its low-cost peers is that this is mostly a way to funnel ticket buyers to the Frontier website. Only tickets booked through Orbitz and other online agencies will carry this charge, and anyone buying tickets on the company's site will avoid the fare. That could boost margins by cutting out the middleman, but it could also crimp sales, as Frontier Airlines is not that well-known nationally. Spirit's own progress since instituting carry-on charges in 2010 shows that travelers are either willing to put up with them or simply too lazy to figure out the full cost of flying, since net income has grown at nearly double the rate of that company's revenue over the past three years. On the other hand, Spirit still draws good business from having the lowest sticker price on travel sites and then tacking on fees later. It remains to be seen how Republic's version of this pricing tactic will work.

It doesn't help that Republic is burdened by far more debt than its low-cost peer, and thus has less wiggle room to try new pricing strategies. On the other hand, Republic's proposed spinoff of the Frontier brand could unlock new value for shareholders and actually provide a more consistent pattern of growth, as Adam Levine-Weinberg shows in his detailed analysis. There are differing ways to play this intriguing low-cost airline with the low share price, and based on the facts on the ground, there may be more than one way to find profit in the stock.

Putting the pieces together
Today, Republic has many of the qualities that make up a great stock, but no stock is truly perfect. Digging deeper can help you uncover the answers you need to make a great buy -- or to stay away from a stock that's going nowhere.