5 Must-See Highlights From Delta Air Lines' Q1 Earnings Call

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Last week, Delta Air Lines (NYSE: DAL) reported strong results for the first quarter of 2019. Revenue for the core airline segment rose 7.5% year over year. Adjusted earnings per share surged 28% to $0.96, cruising past analysts' estimates and management's own guidance.

Following the earnings release, several top Delta Air Lines executives spent an hour discussing the company's strategy and recent performance with Wall Street analysts and the media. Here are five key highlights from their remarks.

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1. AmEx partnership renewal will drive revenue growth

Delta Air Lines recently signed a long-term renewal of its important credit card partnership with American Express (NYSE: AXP). The current AmEx deal had been set to expire in 2022, but the two companies extended their agreement to 2029.

While the exact terms of the new agreement are confidential, Delta expects approximately $500 million of incremental revenue this year from the renewal. That likely indicates that American Express offered improved terms in order to maintain its valuable relationship with Delta.

Delta expects steady growth in revenue from the AmEx partnership beyond 2019, as the number of co-branded credit card holders grows and those cardmembers increase their spending. And there will be another big step-up in revenue in 2023, presumably due to Delta getting an even better revenue split from American Express. As a result, management is highly confident that this high-margin revenue stream will more than double to $7 billion between 2018 and 2023.

2. Diversifying the top line

The American Express partnership is just one of several growing revenue streams helping Delta rely less on the pricing of economy fares, which have been more-or-less commoditized.

For example, Delta got about 35% of its passenger revenue from business class and extra-legroom seats last quarter. New sales techniques and the rollout of premium economy seats across Delta's widebody fleet are driving strong growth in this premium product revenue. The company also expects revenue from its third-party maintenance business to grow at a double-digit clip this year -- surpassing $800 million -- before reaching $2 billion within five years.

3. Customers value the Delta SkyMiles program

The SkyMiles loyalty program is another key driver of sticky, high-margin revenue. Delta has invested in giving customers more options for redeeming their miles, with a particular focus on upgrades to premium seats. These upgrades can now be purchased with miles as part of the initial fare or at any point thereafter, including in the Delta app when checking in.

These efforts are driving strong growth in loyalty redemptions. That's helping to boost Delta's earnings growth, because the carrier defers revenue when it doles out SkyMiles and only books that revenue when the miles are redeemed. Furthermore, the big uptick in SkyMiles redemptions indicates that customers are finding the program more worthwhile. Over time, that will make the SkyMiles currency even more valuable to business partners like American Express.

4. Another aging aircraft type is on the way out

Delta Air Lines' cost performance was just as impressive as its revenue performance last quarter. Adjusted nonfuel unit costs ticked down slightly in Q1, while fuel efficiency improved 2.1% year over year. An aggressive program to upgrade Delta's fleet has been the primary driver of the company's improving cost trends. Recognizing the success of this effort, Delta recently decided to retire its remaining MD-90s earlier than expected.

As of the end of Q1, Delta had 37 MD-90s, with an average age of 22 years. It already has plans to replace its last 79 MD-88s by the end of 2020, but with more than 160 new narrowbody jets set to arrive between now and 2021, Delta should be able to retire its last MD-90s by sometime in mid-to-late 2021, if not earlier. The airline plans to offer more details in the coming months.

5. Free cash flow is accelerating

Delta's aggressive fleet renewal plan has driven a substantial increase in capex recently. This caused free cash flow to recede quite a bit from the highs of a few years ago.

However, Delta has been predicting a rebound in free cash flow to between $3 billion and $4 billion this year. Now, management is increasingly confident about hitting the high end of that target range, largely thanks to the $500 million in incremental revenue expected from the American Express partnership renewal.

An increase in cash tax payments could cause free cash flow to decline again in 2020. But after Delta finishes funding its pension plan -- and as its profit continues to grow -- free cash flow should be able to march even higher, allowing Delta to reward its shareholders with steady dividend growth and share buybacks.

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Adam Levine-Weinberg owns shares of Delta Air Lines. The Motley Fool owns shares of and recommends Delta Air Lines. The Motley Fool has a disclosure policy.