Delta Air Lines (NYSE: DAL) recently released earnings and the results were excellent, checking off nearly all the items many investors look for from a company in the transportation sector. As such, the stock remains a great investment option for those seeking a long-term growth stock.

That's the overarching take on Delta. Now let's take a closer look at why this is the best airline stock to buy at the moment.

The investment case for Delta is based on a belief in the enduring nature of the recovery in commercial air travel, the airline's shift toward higher-margin premium services including its premium cabin ticket sales, and its loyalty-related revenue. In addition, investors are hoping Delta keeps costs under control and meets its full-year free-cash-flow guidance of $3 billion to $4 billion, allowing it to repay debt built up during the pandemic.

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Source Fool.com