Where did you download your phpVMS from? The most stable version for PHP 5.6 is this: https://github.com/DavidJClark/phpvms_5.5.x
As for the airport issue, do you have any Config::Set('PHPVMS_API_SERVER' set in your local.config.php file? If yes, what is its value? If not, add this:
Config::Set('PHPVMS_API_SERVER', 'http://api.vacentral.net');