The company confirmed the news in a statement to 9to5Mac:
We’re discontinuing the Apple AirPort base station products. They will be available through Apple.com, Apple’s retail stores and Apple Authorized Resellers while supplies last.
The announcement doesn't come as much of a shock. The AirPort Express hasn't been updated since 2012 and the AirPort Extreme and Time Capsule haven't seen an update since 2013. In late 2016, Bloomberg reported that Apple shutdown the wireless router team and dispersed engineers to other projects.
Another big hint was when Apple began carrying the Linksys Velop Whole Home Mesh Wi-Fi System earlier this year.
We're sad to see the AirPort router go. Despite not being updated in ages, users still rated it number one in customer satisfaction. Apple easily beat its competition to be the only wireless router awarded a five star rating with a score of 876 out of 1000.