FLY! II
Official site. Offers program information, knowledge base, FAQs, downloads, screenshots, product support, and links.
Maximum3d.com: Fly!
Reviewed by Scott Meyers. "I would highly recommend this game to someone learning to fly, as the instrument flying is second to none."
The Adrenaline Vault: Fly!
Review by Adam Swiderski. "This is one advanced, playably deep simulation on the piloting of civilian aircraft."