A Fast Going 777!

Tue Sep 05, 2000 11:24 am


I was just tracking some flights and I got this AF flight 009 from JFK to
It's a 777 and constantly cruising at 616 kn at 37.000ft:
Compared to the other flights that are on JFK - CDG right now it's
cruising like 60 - 70 kn faster.
Is the 777 always going that fast or just 'today'.

Cheers, B737-700

RE: A Fast Going 777!

Tue Sep 05, 2000 11:45 am

Well, I don't know how to convert kn into km, but for the latest 2 B777-200 flight I have with Malaysia airlines and Singapore airlines (22nd June and 23th of July), MAS was cruising at the speed of 850km/h and SIA was 899km/h. I have forgotten the altitute, sorry, but both flight arrived 30 minutes earlier then the schedule time (PER--KUL and SIN--PER).
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Knt To Km/h Conversion

Tue Sep 05, 2000 11:47 am

1 knot is 1.852kilometres. Hope this helps!

RE: Knt To Km/h Conversion

Tue Sep 05, 2000 11:57 am

And for your Western friends? 

RE: A Fast Going 777!

Tue Sep 05, 2000 11:57 am

If 1kn = 1.852km, 616kn=1140.8km/h!
The aircraft was overspeed or not?
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RE: We're Nuts

Tue Sep 05, 2000 12:06 pm

I don't exactly know what you mean by "And for your Western friends?"

RE: We're Nuts

Tue Sep 05, 2000 1:02 pm

I wanted to know the conversion rate for those of us still relying on the Mile.

RE: We're Nuts

Tue Sep 05, 2000 1:09 pm

Do u convert it with these 1.85 or do u use the mile with 1.65 ??

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RE: A Fast Going 777!

Tue Sep 05, 2000 2:07 pm

It is not uncommon for a 777 or a 747 to travel at these speeds, especially with a good tail wind. This mostly happens on flights over the Atlantic in the eastern direction (to Europe). But anything over 1100 km/h sounds a little too fast to me. It is getting pretty close to Mach 1, the speed of sound in this one. Might even be dangerous.
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RE: A Fast Going 777!

Tue Sep 05, 2000 3:02 pm

Those amazing speeds are relative to the ground. For the plane itself, its AIRSPEED is probably at normal cruise levels.

It's not uncommon for strong tailwinds to add significantly to the relative ground speed of a cruising plane. Last year when I flew JFK-LHR on an AA A300-600 (not a very fast aircraft to begin with), the airshow indicated that the ground speed is over 1100 km/h. The flight lasted a little more than 5 hours.

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RE: A Fast Going 777!

Tue Sep 05, 2000 5:24 pm

If you hit the right tailwind, eastward flights across the Northern Hemisphere can be quite fast. That's how come:

1. Most long-range airliners can fly NRT-SFO in around 8 hours, sometimes less.

2. LAX-JFK cross can be quite fast. One time, a Pan Am 741 picked up very favorable tail winds and flew this route in 3 hours and 55 minutes! (It normally takes almost five hours.)

3. SQ was able to fly the 747-300 from HKG to SFO non-stop (it had to do a "technical stop" fuel in HNL flying from SFO to HKG).
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Km/h To Mile Conversion

Wed Sep 06, 2000 8:24 am

I don't know the direct conversion to knt to mile but the km/h to mile conversion is:
1 mile=1,609344 Kilometres.

Hope this helps!  
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I Made A Typo!

Wed Sep 06, 2000 8:25 am

It's 1mile= 1.609344 Kilometres. (NOT 1,609344)

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RE: I Made A Typo!

Wed Sep 06, 2000 10:38 am


that depends on whether you're European or not.


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RE: A Fast Going 777!

Wed Sep 06, 2000 10:34 pm


Indeed, VH-OJO, I know these high speeds can be experienced when the tailwind is good.

Once I remember a fight EZE-CDG on a AF 747-400 which was close to 1,100kmph.

Best regards,
Alain Mengus
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RE: A Fast Going 777!

Wed Sep 06, 2000 10:53 pm

When I flew from HNL-IAH on a DC-10, once we hit cruising altitude the airshow said we were doing about 680mph, Once we hit the California coast we slowed to about 560mph. On the way to Hawaii we did about 580mph the whole way.

RE: A Fast Going 777!

Thu Sep 07, 2000 2:53 am

I bet the A340-200/300 can't do these flights compared the Boeing 747 & 777.
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RE: A Fast Going 777!

Thu Sep 07, 2000 4:02 am

This thread started talking about knots - nautical miles per hour. One knot = 1,151 mph or 1,852 kmh.
One nautical mile is simply one arc minute at the Equator. And the km was defined as 1/40,000 of the circumference of the Earth. And there goes 60 arc minutes on one degree of which there are 360 around the globe. So one nautical mile is exactly 40,000 / (360 * 60) = 1.8518518 km. What a mile is, that's something which the Americans must explain. At least the Englishmen are now slowly going metric, inch by inch.
And all this is groundspeed based on GPS calculations. It can be airspeed and anything from plus or minus 300 kmh - that's how strong winds can be up there. My fastest ever was between Zurich and Madrid on an A320, 1164 kmh (628 kn, 723 mph). Had it been airspeed, then at our altitude 31,000 ft. we would have been supersonic. Speed of sound is not constant, but decreases slightly as air density decreases. Sure the Swissair accountant smiled when he saw the fuel bill for that flight. Back again a couple of days later, also on an A320, I never noticed more than 750 kmh. Sure there was headwind, but not nearly as much as the former tailwind.
Best regards, Preben Norholm
Always keep your number of landings equal to your number of take-offs

RE: A Fast Going 777!

Thu Sep 07, 2000 6:57 am

When I was going to SEA our alt. was 39,000 and our avg. speed was almost 600 knots. They are almost over powered!


RE: 777 Is Fast Westbound Too!

Thu Sep 07, 2000 7:26 am

On my UA MUC-IAD flight this summer I heard some interesting chatter on Ch. 9. After take-off from a rainy MUC we passed LH 410 which had taken off a few minutes earlier. I am pretty sure this was the A340 that was bound for EWR. Once we reached flight level 350, the LH flight was about to make the same altitude and course, so ATC asked us to expedite to .86 mach & the LH flight to slow down to .78 to provide separation. The LH captain didn’t seem too pleased. Initially, the UA captain didn't seem too pleased either as it must have required a good fuel burn rate. But about 10 minutes later ATC asked if .86 was still ok, and he said was. I was impressed that we could make this speed so early in the flight. But this may be because the jet stream counts toward the speed too. Still, we got into IAD 30 minutes early (& probably before the A340 puttered EWR).

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