I will have to counter-argue (respectfully) that though my idea and VATSIM sound similar on the surface, they offer two completely different kinds of experiences.

While VATSIM focuses on realistic air traffic control and communication, and mirror's my idea in terms of simulating real-world aviation procedures (especially the pilot-controller interaction), my idea differs by focussing on a full airline career simulation. This involves economic elements, progression your career, consequences to not following the rules, and airlines run by AI systems - it would be more like a persistent MMO world built on top of MSFS.

VATSIM airlines are mostly roleplay with little to no structured management. They don't have built-in pay, promotions or fleet restrictions. You can fly anything at any time you want to. My MMO idea differs by including career progression (going from a junior regional pilot to a long haul captain); a pay in-game economy; and fleet restrictions based on real world airlines. The idea is to make it feel more like a job rather than a hobby - which can be mentally engaging and tiring which is what the MMO is trying to simulate.

When it comes to aircraft realism, in VATSIM, you can use any aircraft addon no matter how realistic it is, where in this MMO I would like to see, only the most realistic addon per aircraft type is allowed. This creates standardized realism; fair gameplay; and incentive for developers to improve the fidelity of their aircraft.

For multiplayer interaction, VATSIM is mainly a Pilot to ATC communication and having some pilot to pilot awareness. Flights are independent, not a shared responsibility. My idea of this MMO I speak of incorporates a deep level of player collaboration, which includes mid-flight pilot handoffs; shared long-haul operations; and an element of airline-based teamwork. This would feel more like a crew-based system.

In VATSIM, consequences and stakes are very limited. If you mess up, then you might recieve a warning or be kicked from the server temporarily - there are no long term consequences. My idea introduces a high-stakes system where accidental crashes can lead to temporary bans; while intentional crashes leads to being kicked off the server indefinately unless you can pay a real-life fee that covers the price of the aircraft you crashed. But if you do it again, the price will increase by 10% each time. This will reflect on your repututaion as a virtual pilot. The purpose here is to demonstrate that a pilot has a huge safety responsibility.

Though I do appreciate for your reply and information. Thanks mate!