The worldwide recovery in travel spending has been incredible. Credit card giant American Express saw spending across its travel and entertainment category grow by 39% year over year in the first quarter as people use their pandemic-era savings to buy plane tickets, hotel stays, and other experiences.

One American Express partner that is seeing a huge tailwind from this spending is Delta Air Lines (NYSE: DAL). The international airline is seeing revenue surge and profit margins expand as people spend money on long-distance flights this year. Shares of the stock are up 44% year to date to $47 but are still off significantly from their all-time high of around $60 set before the COVID-19 pandemic. 

The Roaring '20s look to be in full swing, with consumers spending like mad on travel experiences. Does this mean investors are still underestimating Delta Air Lines? Let's take a look. 

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Source Fool.com