javascript - Angular.js track by ng-options on key of object -

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consider following object:

var orderedflights = {    "airline 1": {},    "airline 2": {},    "airline 3": {} }

using ng-options possible track by on keys of object?

<select      class="form-control"      ng-change="flightnumber = airline[0]"      name="airline"      id="airline"      ng-model="airline"      ng-options="airline (airline, flights) in orderedflights track airline"> </select>

try 

 ng-options="airline airline (airline, flights)  in orderedflights track airline">

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