Announcement

Collapse
No announcement yet.

767 vs. 777 or Delta vs. AA

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • 767 vs. 777 or Delta vs. AA

    i was tracking my sister's flight tonight DL 3 JFK-LHR and noticed that it has a scheduled 7hr 15 min flight time. DL uses the 767-300 on this trip. by comparison, AA uses the 777-200 on the same trip.

    using flight aware, i found that AA's flights are on average, 30~ minutes shorter than Delta's. why do you suppose there is a consistent difference? is the 777 faster?

  • #2
    The B777-200's are faster than the B767-300's but only by 30 mph. And considering it is only a 3440 mile trip there shouldn't be that large a difference.
    Are both flights direct? And what time of the day are the flights as it might be due to the ground or air traffic at the airport.

    Comment


    • #3
      The 777s routinely cruise at M0.82 to M0.84 while the cruising speed of the 767 is in the M0.78 to M0.8 range. That's quite a difference and might well account for the longer duration of the Delta flight.
      By the way - cruising slower also saves fuel.

      Comment


      • #4
        While the 777 is indeed faster than the 767, there are other factors that factor into the scheduled flight time of an airline. For one, the slots the airlines have, which in DL's case at LHR, are far from ideal. And the other thing is the so-called schedule padding, meaning that an airline will on purpose schedule a longer flight time than is actually needed to avoid delays, especially at airports that tend to get delay-prone like both LHR and JFK.

        Comment


        • #5
          thanks for the replies. padding is not the issue, as i was looking at actual flight times over several days. i suspect that 30 mph over the course of a six hour flight makes most if the difference.

          Comment


          • #6
            Originally posted by TeeVee View Post
            thanks for the replies. padding is not the issue, as i was looking at actual flight times over several days. i suspect that 30 mph over the course of a six hour flight makes most if the difference.
            Gosh, don't 6-hour flights take exactly the same amount of time, regardless of speed?
            Les règles de l'aviation de base découragent de longues périodes de dur tirer vers le haut.

            Comment


            • #7
              Actually, the vast majority of them are 764's, not 763's; although the occasional one sneaks in. Even at 30 mph faster, it should be as drastic as 30 minutes. However, knowing Delta, the flight probably leaves a bit late too.
              Flown on: 146, 319, 320, 321, 717, 722, 732, 733, 737, 738, 744, 752, 753, 762, 763, 764, 772, AT7, CR1, CR2, CR7, CR9, 328, D9S, D95, 135, 145, 170, 175, F100, L10, M11, M88, M90

              Comment


              • #8
                an other contributing factor could be the ETOPS on a 767 vs 777 which lead to a different routing.
                Ciao,
                Jason

                Comment

                Working...
                X