Momentum investing is essentially the opposite of the tried-and-tested Wall Street adage -- "buy low and sell high." Investors following this investing style typically avoid betting on cheap stocks and waiting long for them to recover. They believe instead that one could make far more money in lesser time by "buying high and selling higher."

Everyone likes betting on fast-moving trending stocks, but it isn't easy to determine the right entry point. These stocks often lose momentum when their future growth potential fails to justify their swelled-up valuation. In that phase, investors find themselves invested in shares that have limited to no upside or even a downside. So, betting on a stock just by looking at the traditional momentum parameters could be risky at times.

It could be safer to invest in bargain stocks that have been witnessing price momentum recently. While the Zacks Momentum Style Score (part of the Zacks Style Scores system), which pays close attention to trends in a stock's price or earnings, is pretty useful in identifying great momentum stocks, our 'Fast-Paced Momentum at a Bargain' screen comes handy in spotting fast-moving stocks that are still attractively priced.

Air France-KLM SA (AFLYY) is one of the several great candidates that made it through the screen. While there are numerous reasons why this stock is a great choice, here are the most vital ones:

Investors' growing interest in a stock is reflected in its recent price increase. A price change of 22.6% over the past four weeks positions the stock of this company well in this regard.

While any stock can see a spike in price for a short period, it takes a real momentum player to deliver positive returns for a longer time frame. AFLYY meets this criterion too, as the stock gained 7% over the past 12 weeks.

Moreover, the momentum for AFLYY is fast paced, as the stock currently has a beta of 1.68. This indicates that the stock moves 68% higher than the market in either direction.

Given this price performance, it is no surprise that AFLYY has a Momentum Score of B, which indicates that this is the right time to enter the stock to take advantage of the momentum with the highest probability of success.

In addition to a favorable Momentum Score, an upward trend in earnings estimate revisions has helped AFLYY earn a Zacks Rank #2 (Buy). Our research shows that the momentum-effect is quite strong among Zacks Rank #1 and #2 stocks. That's because as covering analysts raise their earnings estimates for a stock, more and more investors take an interest in it, helping its price race to keep up. You can see the complete list of today's Zacks Rank #1 (Strong Buy) stocks here >>>>