There’s been a lot of comparison with FSLTL, but it’s important to understand that BeyondATC and FSLTL operate in fundamentally different ways.
FSLTL injects aircraft into the simulator at specific positions, but once injected, control of those aircraft is handed over entirely to MSFS. This is why features like jetway connections work seamlessly, FSLTL does not use SimConnect events to control aircraft behavior after injection.
Because FSLTL relies on the internal MSFS traffic engine, it can take advantage of data and features that are not accessible to third-party developers - such as certain weather data. This lack of full access has long been a point of contention between third-party developers and Asobo. It is also why, for example, no third-party aircraft can yet implement a truly accurate and dynamic weather radar. BeyondATC, like all third-party tools, is subject to these same platform limitations (unless paying for an unbelievable price to get accurate and live data).
For reference: Implement weather and terrain API’s for aircraft developers to implement accurate radar, predictive windshear, EGPWS, and METAR/wind uplink - Official Microsoft Flight Simulator / Wishlist - Microsoft Flight Simulator Forums (a request from 2021!)
BeyondATC, by contrast, not only injects AI aircraft but also fully controls them on a frame-by-frame basis. MSFS does not manage any aspect of AI aircraft movement or traffic control when using BeyondATC, all of this is handled entirely by the BeyondATC engine.
Both solutions have their own strengths and limitations. The team has been very clear about their goal: to provide an additional tool that offers the community a more integrated ATC and traffic experience. It may not align with everyone’s preferences, but many users are already appreciating the improved realism, fluidity, and control that this implementation brings to MSFS even at this early access stage. We are fortunate that most of our users have been very understanding and highly collaborative, actively helping the team improve the software and troubleshoot complex issues. And BeyondATC is not intended to overshadow or replace other solutions, each of which has its own unique strengths and may better suit different user needs, which is very great for the whole community.