Optimize / Speed Up AngularJS HTML rendering - Performance Issue

This is probably not the first question on this topic, but since it took me hours finding out I couldn't find a good solution, I still want to ask you guys here.

I would like to optimize following code, because the page needs a few seconds to load right now. If I take that part out of the page (it is only one part of it), the page loads in max 1 second.

FYI: I only have 4 routes for the student that I test my application with.

<tr ng-repeat="route in student.itin">
      <td>
         <select ng-options="airline._id as airline.code for airline in ::airlines | orderBy: 'code'" ng-model="route.airline" class="form-control"/>
      </td>
      <td>
         <input type="text" ng-model="route.flight_number" maxlength="4" size="4" class="form-control"/>
      </td>
      <td>
         <input type="text" ng-model="route.class" maxlength="1" size="1" class="form-control"/>
      </td>
      <td>
         <select ng-options="airport._id as airport.code for airport in ::airports | orderBy: 'code'" ng-model="route.departure.airport" class="form-control"/>
      </td>
      <td>
         <div class="form-group has-feedback" ng-class="{'has-error': route.arrival.date < route.departure.date}">
             <input type="text" class="form-control" is-open="datepickers['departure_date' + $index]" max-date="route.arrival.date" timepicker-options="timepicker_options" ng-focus="open($event, 'departure_date'+$index)" datetime-picker="{{ ::datetimepicker_format }}" ng-model="route.departure.date" />

             <span ng-if="route.arrival.date < route.departure.date" tooltip-placement="right" tooltip="Arrival Date cannot be before Departure Date" tooltip-trigger="mouseenter" class="glyphicon glyphicon-remove form-control-feedback" aria-hidden="true"></span>
         </div>
      </td>
      <td>
         <select ng-options="airport._id as airport.code for airport in ::airports | orderBy: 'code'" ng-model="route.arrival.airport" class="form-control"/>
      </td>
      <td>
         <div class="form-group has-feedback" ng-class="{'has-error': route.arrival.date < route.departure.date}">
             <input type="text" class="form-control" is-open="datepickers['arrival_date' + $index]" min-date="route.departure.date" timepicker-options="timepicker_options" ng-focus="open($event, 'arrival_date'+$index)" datetime-picker="{{ ::datetimepicker_format }}" ng-model="route.arrival.date" />

             <span ng-if="route.arrival.date < route.departure.date" tooltip-placement="right" tooltip="Arrival Date cannot be before Departure Date" tooltip-trigger="mouseenter" class="glyphicon glyphicon-remove form-control-feedback" aria-hidden="true"></span>
         </div>
      </td>
      <td>
         <input type="text" ng-model="route.filekey" class="form-control"/>
      </td>
      <td class="text-right">
         <a class="btn btn-danger" ng-click="deleteRoute($index)" tooltip-placement="top" tooltip="Delete route" tooltip-trigger="mouseenter">
              <i class="fa fa-trash-o"></i>
         </a>
      </td>
</tr>

What I have learned from my research is pretty much that I shouldn't use too much ng-repeat, try to minimize data-binding and filters. But after applying everything I have learned, I came up with the code above and don't know how to go on optimizing, since this is not enough.

Thank you