I just booked a RGN-SIN-LHR-JFK (search as multi-city) on b-t for $395. First two flights are in SQ C, last flight on Delta. This will--if it goes through--be issued on DL stock, which is a good thing considering what SQ just did to the last RGN deal.
The ticket is fully refundable, though it looks like b-t charges a $100 fee:
Airline: Delta
Travel Route: Mingaladon Int'l (RGN), Rangoon, Myanmar-John F Kennedy Intl (JFK), New York, NY, USA
Fare Basis: CFFWMM
Booking Code: C
Very important: You must cancel your reservation prior to the scheduled departure if you cannot travel as booked; else your ticket is automatically forfeited. You may cancel the reservation online by clicking on the My Trips hyperlink and locating your reservation, by calling our customer service during our business hours or by calling the ticketing airline.
PENALTIES
NOTE - CHANGES AND CANCELLATIONS PERMITTED. -FOR CANCELLATION AFTER DEPARTURE- THE REFUND GIVEN WILL BE THE DIFFERENCE BETWEEN THE FARE PAID AND THE APPLICABLE FARE FOR THE
JOURNEY FLOWN
A $100.00 agency service fee collected in addition to any airline specified fees is required to begin processing each reservation cancellation or change. The non-refundable fee applies per person, for all passengers except accompanied infants.
Refund note: It may take up to 8 weeks for a refund to be posted to your credit card or bank account in case of qualifying cancellation. Refund processing duration is determined by each ticketing airline.