I am very much sure that both domains are not belonged to one company. Makemytrip is very well known company in travel domain in India and yatra is his main competitor in India. It is current that both are fighting to grab the market using different techniques.

If its a DNS redirect then how one company can do without having the access to the server of another company. Very strange, on the other hand very interesting thing to learn.

That is sure that yatraonline.in is not getting benefit from this setting because google is reading yatra.com not yatraonline.

Anyone who have the knowledge of server settings must know this as well.

Thanks
Ashish