Hi acosaburca,
Unfortunately the response to AirlineMGR wasn't as high as I'd hoped, and due to work commitments I never got to develop the game further, as I had hoped. As a result I pulled it from sale a while ago.
I've decided to offer it as a free download, instead. If anyone is interested, download it and have a play. if there's enough interest, I may consider developing it further and producing another version.
You can download it here:
http://www.airlinemgr.com/