It was not known how many passengers were on board but a Boeing 787 can carry 375 passengers while an Airbus 350 can carry 306 passengers.
Kudos to them for getting the Delta A350 seating capacity right.. wonder where that 787 figure came from. It doesn't match the exit row limit for any versions but it is also way higher than what any 787 actually carries. Even Norwegian's 789s only carry 334 and they have no J cabin. Just seems funny since it gives the impression that the 787 is bigger than the A350 when the opposite is true (or, at least, the smallest A350 is equal to the the biggest 787-10).