How can I group json data by RefId after grouping same data by airlinename in AngularJS?

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AngularJs

I'm having go at some AngularJS for the first time in order to create a Airline Ticket Booking module.

With json data, i have created a groupby method, my problem is that couldn't groupby with refId after grouping grouped json data.

Like want to show connecting flight module- Delhi to Banglore(with one stop.{ Delhi >> Mumbai and then Mumbai >> Banglore}).

Sample working code::<a href="http://plnkr.co/edit/MzlrglVDxtIkqZVXcKa4?p=preview">plnkr.co</a> <pre>

My problem area is that unable to group data by refId inside Details section like makemytrip.com for one or more stops after groupFilter by AirlineName.

My problem area is that unable to group data by refId inside Details section like makemytrip.com for one or more stops after groupFilter by AirlineName.

1 AIR INDIA

Delhi >> Chennai

     - Details

     Delhi >  Goa   ( problem with groupBy refId under -Details Sec.)

     Goa   >  Chennai

2 GO AIR

Delhi >> Calcutta

        + Details

3 INDIGO

Delhi >> Banglore

        - Details

   Delhi  > Mumbai

   Mumbai > Banglore

Is there any export of angularjs, pls help me to solve this trouble..

Any and all help/advice is sincerely appreciated.

Thanks.