As per this post: http://forum.phpvms.net/topic/22757-vacentral-status-and-updates/#entry120870
The phpVMS API server is now redundant, so change your code to look like this:
Config::Set('AIRPORT_LOOKUP_SERVER', 'phpvms');
Config::Set('PHPVMS_API_SERVER', 'http://api.vacentral.net');
Config::Set('PHPVMS_NEWS_FEED', 'http://feeds.feedburner.com/phpvms');
Config::Set('VACENTRAL_NEWS_FEED', 'http://feeds.feedburner.com/vacentral');
Config::Set('GEONAME_API_SERVER', 'http://ws.geonames.org');
In your local.config.php file