Our group uses
aircraftclubs.com , which is FREE for 30 days. After 30 days, the cost is $4.95 per plane per month for unlimited Internet access or $9.95 per plane per month for unlimited Internet AND toll-free voice access. You can save 20% by paying yearly which equates to $49.95 or $99.95 per year respectively.
The quality of service has not been a problem on this site over the last 18 months we've been using it.