This is how AirVPN is described on their own page:
AirVPN started as a completely free service for anyone in April 2010. Soon it added a commercial side aimed to keep the project financially sustainable, capable to support the impact of free access to activists in human rights hostile countries and ensure to the team a monetary basis which could allow a full-time dedication.
Today, AirVPN is operated exclusively by activists, privacy, data protection and security issues aware persons, law experts with the help of the same lawyers, and counts more than 80 servers with high bandwidth lines and good or top hardware in 15 data centers across 16 countries in 3 continents. The solidity of the infrastructure is enhanced literally every week, so that most attacks (UDP and TCP flood, DDoS…) that caused service issues in the first AirVPN year of life now remain totally unnoticed to the users.
The customer service is not and has never been outsourced in order to provide high quality of support.
As far as we know, AirVPN is the only VPN in the world which transparently let anyone access a servers monitor on the www, updated every 60 seconds, to check the infrastructure status and verify that we respect our no-overselling and guaranteed allocated bandwidth commitments stated in the ToS. AirVPN also provides some features which might go unnoticed to the masses but which are important, such as separate entry and exit IP addresses on every VPN server to prevent some correlation attacks, typical on VPNs with a shared IP which is used both as entry and exit-IP address.