Can someone explain what virtual airlines are and how I can be involved
They are virtual companies that fly on scheduled/charter operations (depending on the company)
You can find the list here
Virtual Airlines are groups of people that replicate a real airlines operations, but in Infinite Flight, henceforth the “Virtual” There are many VAs open right now, and a lot of Virtual Organizations, like TFC and IFGAC. You can check out VA/VO’s thread in #live:va, and you can find application forms on their thread.