The $1.7 Billion Terminal Bet That Just Became America's Most Oversubscribed Airport Bond

San Antonio International Airport (SAT) is currently implementing its $2.5 billion 'Elevate/SAT' capital improvement plan. This includes multiple infrastructure projects, and the airport completed a new Ground Load Facility for Terminal A in March 2026. Meanwhile, the airport broke ground on the new Terminal C in December 2024, and the project is roughly 25% complete.

To help finance the new terminal, which then had an estimated cost of $1.4 billion, SAT issued $866.44 million in airport revenue and refunding bonds in July 2026, and the response was astonishing. Investors submitted approximately $3.9 billion in orders, amounting to about $4.50 submitted for every dollar offered.

What's more, 61 out of the 78 participating institutions were new investors in the airport's debt. It was a striking vote of confidence in the airport, and it's especially notable considering that SAT is a fairly small airport. As the airport expands, investors are taking notice of the potential of regional spokes like SAT and of where traffic demand in the US is growing.

What The New Terminal C Will Provide

Terminal C will be SAT's third airline terminal, joining Terminals A and B. It's currently projected that the airport will hold the topping-off ceremony for the terminal before the end of the fall season in 2026, while it should open in the second quarter of 2028. In addition to the aforementioned investments, SAT has also received significant federal backing for the new terminal.

It will provide a significant increase in capacity for the airport, which has also been expanding other facilities. Terminal C will provide up to 18 gates and will be capable of accommodating domestic as well as international flights. The terminal will include a Federal Inspection Station (FIS) as well as a larger central screening area.

It will offer 29,000 square feet (2,694 square meters) of lounge space, with 10,000 square feet (929 square meters) being allocated to a new American Airlines Admirals Club and a new Delta Air Lines SkyClub, along with another undisclosed lounge. The new terminal will offer over 850,000 square feet (78,968 square meters) of space in total, with about 41,000 square feet (3,809 square meters) being allocated to new dining options.

The airport will offer options from local vendors, open seating, and abundant natural lighting. The gate waiting areas will be enlarged compared to those in the other terminals, while new walking options and an indoor courtyard have also been added. Furthermore, the terminal will feature improved roadways for better traffic flow and reduced congestion.

The Response To The Bond Issuing

The fact that the sale was so oversubscribed was a major surprise, especially considering that this is a brand new terminal that isn't replacing older facilities at an airport with fairly modest traffic. Fundamentally, what this illustrates is that investors are highly confident in the airport's ability to repay its debt.

Crucially, however, this is not the same as whether San Antonio will steal traffic away from other airports in the region, or if it will even grow all that much as the bonds aren't really tied to huge passenger numbers. The bonds are backed by the airport's revenue, which is influenced by factors like airline agreements, financial reserves, and debt service coverage.

This doesn't necessarily require SAT to become a massive hub, but rather one that will easily repay its debt. With the terms offered, as well as the airport's agreements with airlines and growth projections, the project is clearly being seen as a relatively safe investment, which is why the bonds were so heavily oversubscribed when they were issued. SAT ultimately isn't going to become a major hub like Dallas/Fort Worth or Houston.

After all, the airport is also being overshadowed by nearby Austin Bergstrom International Airport (AUS). However, it is looking to attract new nonstop routes and receive additional services from airlines, which will significantly increase revenue. In addition to the general course of the project and the airport's traffic projections, the terminal is also seen as a safe investment because of recent developments with SAT's largest airline.

San Antonio & Southwest Airlines

Southwest Airlines is the largest airline serving SAT, holding about 37% market share. However, as San Antonio began firming up its plans for the new Terminal C and other improvement projects, disputes began between it and Southwest. In 2024, the Dallas-based airline filed a lawsuit against the City of San Antonio, alleging that the city failed to uphold verbal commitments for gate allocations at the new Terminal C.

The two parties had been disputing the issue for almost two years. In May 2026, however, Southwest and the City of San Antonio finally reached a settlement, with the city approving an Airline Use and Lease Agreement that guarantees Southwest at least three gates in Terminal C as well as three gates in the updated Terminal B. With this, the carrier's access to the new facility is fully secured

​​​​​​​This has eliminated what was a source of uncertainty for those involved with the Terminal C project, especially considering that Southwest is the largest airline in the San Antonio market (note that SAT is not an operating base for Southwest). Given the timing, this significantly improved the prospects of SAT earning enough revenue to pay back its debt, and the settlement with Southwest undoubtedly influenced investors' decision to subscribe to SAT's bonds in July.

Despite the fact that construction is still ongoing (which increases risks to investors), it's overall proving to be a worthwhile investment for those who have committed their funds to the program. San Antonio also continues to receive federal support for various airfield improvements, further improving the optics of committing money to SAT.

The Risks Associated With SAT's New Terminal

The new terminal is still under construction, and this means that the project's costs could go up, depending on changes to the terminal or construction delays. Already, the cost has risen significantly, as the original 2023 estimate priced the project at $1 billion, and it's continued to rise in the years since. At the time of the bond issuance in July, the terminal cost was an estimated $1.4 billion.

Meanwhile, the most recent estimates place the cost at $1.7 billion, due to changes in the project's scope. But in addition to the project cost, SAT airport also hasn't been growing significantly. 2025 actually saw a slight decrease in annual passenger numbers, while the first six months of 2026 saw a slight decline again compared to the same period in 2025.

​​​​​​​The airport hopes to handle about 14.5 million annually by 2040, whereas its record set in 2024 was just over 11 million passengers. If the airport continues to stagnate or decline, this can make the terminal a riskier proposition. This, of course, isn't to suggest that the new terminal will fail or that the airport will have difficulty in repaying the money invested in its bonds.

If anything, the present factors make the interest in the bonds even more impressive, as it demonstrates that investors are quite confident in the probability that they will be paid back despite the fact that the airport's passenger figures haven't been rising and project costs are growing. Of course, regional spokes are generally becoming popular, as is the Sun Belt.

Other Improvements Coming To SAT

The new Terminal C is the largest part of the Elevate/SAT initiative, but it's far from the only enhancement for the airport. Earlier this year, SAT added new ground loading positions, an FIS, more passenger seating, and more dining options to Terminal A that are meant to appeal to budget airlines in particular.

In addition to these improvements, the airport will also renovate Terminals A and B for greater efficiency and a better passenger experience, extending their useful lives until past 2048. SAT is also investing in roadway improvements to reduce congestion and making safety enhancements to the airfield. As a whole, San Antonio International Airport will become a significantly more efficient airport that's far more pleasant for passengers.

It will also have a higher capacity than today. Although the airport isn't necessarily booming today, SAT is positioning itself for the future as it's located within the fastest-growing region in the United States. States like Texas, Arizona, Florida, and the Carolinas are experiencing significant growth in population, while their economies are also growing.

​​​​​​​In Texas, nearby Austin has boomed in recent years, and while AUS has absorbed most of the demand, SAT has benefited as well. Meanwhile, as major hubs become increasingly constrained, this increases the appeal of serving smaller, less congested airports nonstop, where passengers are willing to pay extra for nonstop service and operating costs are lower.