Hi,
There isn't a way right now in the app - the "easiest" way is to change the settings.xml file (in Documents/phpvms) - so have one called "settings_va1.xml" and "settings_va2.xml", and rename whichever one you want to be active to "settings.xml". I'm slowly making the internal changes to make this possible (like a dropdown or something to be able to change the active airline or select which settings file to load)