We did Mardi Himal Trek independently. And we had 3 more days before we could go back to the USA. My friend insisted to do a Heli tour to Everest. We found TRA on the website and read reviews and had contact with Naba directly. He quicked managed to call me and we booked. He was responsive, and professional. He have good connection for heli service. We loved the service and company's service.