The Brussels Airport is the latest international airport to use a program called BlipTrack, which relies on sensor technology to more accurately predict wait times for customers.

The program helps airports measure the flow of passenger traffic, which enables them to more accurately relay information on wait times on screens and mobile devices via the BlipTrack app.

The sensors can detect WiFi from mobile phones and tablets, and that information is then collected to better understand the length of lines and movement patterns. Other airports already using the technology include New York’s John F. Kennedy International, Amsterdam Schiphol, Barcelona El-Prat, Copenhagen (CPH), Dublin (DUB), Edinburgh (EDI), Cincinnati (CVG), Keflavik (KEF) and Oslo (OSL).

“Today, many airports display wait times. Typically, this is done by measuring the wait time of people leaving the queue. However, these wait times may not be accurate for those entering the queue, especially if the flow of people suddenly changes,” said Christian Bugislaus, marketing manager, Blip Systems in a statement. “BlipTrack works by measuring the number of people in line and the average throughput of the area. With these two measurements, accurate wait time, for those entering the line, can be displayed. For example, if there are 100 passengers in line and the processing rate of the area is 15 people per minute, the predicted wait time is 6.5 minutes.”