Raunaq Q.’s question answered:
As new technology has developed, with airplanes capable of flying longer distances the ultra long-hauls have become a reality.
Research among the airline’s route planners also
It wasn’t long ago that a 12-hour non-stop flight was the limit of time an airplane could stay in the air without stopping for refueling.
The cons of these types of flights, however, is that it’s hard on our bodies to be stuck in that “metal-tube” for ie 17 hours at a time.
Thus, the development of the long-haul capabilities has also contributed to another development of renewed interest in supersonic flight.