The Lockheed F-35 Lightning is replacing the F-16 in many countries. For the most part, if a country is flying F-16s, then it's a safe bet that they will get the F-35. There may be some exceptions to that rule, of course, but for the most part, it rings true.
One country slated to receive the F-35 is Belgium. F-16.net reports that, at one point, the Belgian Air Component had as many as 160 F-16A/B Fighting Falcons. Many of these planes were manufactured as part of a consortium with Denmark, Norway, and the Netherlands.
Today, that total stands at 45 F-16AM and nine F-16BM Fighting Falcons. These planes are divided into four operational fighter squadrons primarily equipped with F-16AMs, and one operational conversion unit equipped solely with F-16BMs. This comes out to roughly 11 F-16AMs per squadron.
According to a release on the Defense Security Cooperation Agency website, Belgium will begin to replace its F-16s with F-35s. The planned purchase total, coming in at just over $6.5 billion, is 34 F-35A Lightnings and 38 F135 engines (one for each F-35, plus four spares). This comes out to eight and a half F-35s per squadron.
Now, this may just be the first batch of planes, in which case, it comes out to a more reasonable 17 planes per squadron. A Belgian media report in 2016 noted that the Saab Gripen, Eurofighter Typhoon, the Dassault Rafale, and the F/A-18E/F Super Hornet were also considered by the Belgian government.
In what seems to be a repeat of history, Belgium, Norway, the Netherlands, and Denmark are all buying the F-35 to replace the F-16. In recent years, the Belgian Air Component has seen action in the War on Terror, the NATO intervention in Libya, and has also taken part in the Baltic Air Policing mission, often using F-16AMs.