Timeline for Why can two different airlines have different travel durations for the same itinerary?
Current License: CC BY-SA 3.0
9 events
| when toggle format | what | by | license | comment | |
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| Sep 10, 2014 at 3:59 | comment | added | Relaxed | @AndrewMedico That might be the explanation then, I must have looked at the top speeds or something. | |
| Sep 9, 2014 at 19:53 | comment | added | nobody | @Relaxed What speed numbers are you looking at? I see cruising speeds on Wikipedia of Mach 0.84 for the 777 and 0.84-0.85 for the 747 (Air France) vs. Mach 0.80 for the 757 (Delta). It's not a huge difference (5%), but over ~3000 miles / 6 hours it adds up and corresponds well to the ~5% difference in flight duration. | |
| Sep 9, 2014 at 19:45 | comment | added | reirab | IIRC, the 777 has an ETOPS rating of something like 330 minutes. In other words, it's certified to fly anywhere in the world except about half of Antarctica. | |
| Sep 9, 2014 at 8:56 | comment | added | Burhan Khalid | @gougoul mentioned this in their answer, but just to expand - the number of engines would only come into effect for ETOPS Extended Range Twin Operations (how far away can the plane fly from land if it has two engines) - and in that respect, the 757 has a 120 minutes ETOPS rating. For the 747 this doesn't apply (for obvious reasons). | |
| Sep 9, 2014 at 8:46 | comment | added | Relaxed | @mouviciel But one of the short flights uses a 777 and it's only 5 min longer than the 747 one. Many things might add constraints but until now, I only see speculation but no solid explanation… | |
| Sep 9, 2014 at 7:26 | comment | added | mouviciel | B747 has four engines whereas B757 has only two. This might impact constraints on actual routes. | |
| Sep 9, 2014 at 6:30 | comment | added | Relaxed | Though about this one too but Wikipedia quotes almost the same speed for the 757 and the 747, while the 777 seems actually slower. | |
| Sep 9, 2014 at 3:34 | review | First posts | |||
| Sep 9, 2014 at 4:27 | |||||
| Sep 9, 2014 at 3:31 | history | answered | rubai | CC BY-SA 3.0 |