View Airport

get/create session
if ('username' param exists in the session) {
   if (there is an 'Airport code' param in the form {
      get Airport Code parameter from the form
      get flight and route data from the database
      display data all users can see (code, name, city (with link to View City), country, number of routes, list of routes serving (with links to View Route))
      if ('usertype' param from session == 'm') {
         display manager-specific information (total revenue, daily revenue)
         display link to Edit Airport Form
      }
   }
   else {
      display error message
   }
}
else {
   error message to say user must be logged in
}