FlightAware LLC's business success has, for the most part, flown under the radar in Houston.

Many travelers know about the B2C flight-tracking functionality of FlightAware. "That's a very, very competitive space. We play in that space, but it's not our core business," founder and CEO Daniel Baker says.

These days, the privately held Houston company earns most its revenue from the B2B data it provides to airlines and other aviation clients, according to Baker. He declines to reveal revenue figures, but notes that the company — which bills itself as the world's largest flight-tracking and flight data platform — hasn't taken a penny of outside funding since it started in 2005.

Today, FlightAware employs about 110 people, with the majority of them located in Houston, Baker says. The company also maintains offices in Austin, New York City, London, and Singapore.

By the end of 2020, the companywide workforce should exceed 135, as FlightAware aims to add three new hires per month this year in areas such as Internet of Things, data science, sales, and administration, Baker says. Most of the new employees will work in Houston.

Baker says FlightAware takes an aggressive approach to hiring, with the goal of bringing aboard "really awesome people" who share levels of talent, collaboration, and "culture fit" similar to those of current employees.

By the end of 2021, FlightAware likely will run out of room in its 24,000-square-foot office at 11 Greenway Plaza in the Greenway/Upper Kirby area, Baker says. That means FlightAware will need to take about 15,000 additional square feet at 11 Greenway Plaza or relocate to a different building, he says. The company moved into its current home in 2017 from a 14,000-square-foot office at 8 Greenway Plaza.

Baker, who's a private pilot and a board member of the Smithsonian Institution's National Air and Space Museum, launched the company 15 years ago as a way to combine two passions: software development and aviation.

"It was originally a hobby, and it became a business," Baker says. "It's an unlikely story. We're really, really fortunate that the timing was right."

Although FlightAware started off tracking flights in the general aviation space, it has since expanded to supply aviation data to both travelers and businesses. Each month, about 15 million passengers use the FlightAware app, which earns praise from a slew of travel critics.

Among flight-tracking apps, FlightAware "is a bit of a Swiss army knife," Condé Nast Traveler magazine observes. The FlightAware app lets you follow flights in real time, including where an incoming plane is coming from, how close it is to arriving, and what kind of weather it's encountering en route, the magazine notes. In addition, the app can send push notifications about arrivals, departures, gate changes, flight delays, and flight cancellations.

Now, FlightAware relies on the consumer-facing technology "as a stepping stone to have a bigger impact," Baker says. "Every project that we undertake is larger than the last one."

That "bigger impact" involves cranking out data that enables commercial airlines, cargo carriers, business aviation companies, and air traffic controllers to be proactive instead of reactive regarding flight activity, he says.

FlightAware's corporate customers include United Airlines, Hawaiian Airlines, business-jet operator NetJets and GPS technology provider Garmin. Baker says a North American airline that he declines to name will soon roll out FlightAware technology to its airport gate agents.

For airlines, FlightAware's software delivers data to cut down, among other issues, on problems with flight delays, gate assignments, and flight connections, Baker says. FlightAware pulls data from its network of more than 25,000 receivers on all seven continents.

While the consumer-oriented features of FlightAware's technology face competition from the likes of FlightStats, FlightView, and The Flight Tracker, the B2B landscape is less populated. Over the years, corporate giants like Airbus, Boeing, and IBM have tackled aviation data on their own but have wound up forging data partnerships with FlightAware, according to Baker.

"We see every potential competitor as a future customer," Baker says.