What is phpVMS?
phpVMS is the most popular, free, virtual airline software, with support for various ACARS applications (kACARS, FSACARS, XAcars, FS Flight Keeper, and FSPassengers), AJAX-driven administration panel, complete with financial reports, schedule management and various other features designed for realistic operation of your virtual airline.
For more details, view the hosting details page on fivedev.net.
Even though phpVMS is free, there are still many costs, including server and hosting costs for new and upcoming features. Any amount will be greatly appreciated!