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UA Revising Cruise Mach Numbers  
User currently offlineHighflier92660 From United States of America, joined Apr 2004, 729 posts, RR: 0
Posted (11 years 3 weeks 1 day 2 hours ago) and read 2345 times:

There were several articles today about United Airlines reducing the cruise speeds of their aircraft as a result of spiraling jet fuel prices. Other airlines were attempting to reduce costs by lessening the "tankering" on North Atlantic routes. Since several aircraft are already flying at optimum LR speeds (B-757/767 Mach .80 B-777 Mach .84) how slow are they going to fly them?

6 replies: All unread, jump to last
User currently offlineCPDC10-30 From United Kingdom, joined Feb 2000, 4888 posts, RR: 22
Reply 1, posted (11 years 3 weeks 1 day 1 hour ago) and read 2289 times:

Simply lowering cruise speeds won't offer any cost savings by itself - there are many other factors that come into play namely connecting passengers, crew, aircraft utilization etc. These factors are already taken into account by the flight planning department and they make the decision on route, cruise speed, desired flight level etc. At AC for example, it is not unusual to run the 763 at M0.83-.84 transatlantic if they are running late or have pax with tight connections.

So does this mean essentially that the flight planning process has been changed to strictly give preference to saving fuel?

User currently offlineArtsyman From United States of America, joined Feb 2001, 4747 posts, RR: 32
Reply 2, posted (11 years 3 weeks 1 day 1 hour ago) and read 2278 times:

Other airlines were attempting to reduce costs by lessening the "tankering" on North Atlantic routes

Continental are tankering on every route possible, not just the North Atlantic. The north Atlantic only accounts for a low % of the total flights, where as the rest of the network is thousands of flights.

Tankering saved Continental 1.2 million last month. It is something they are working hard on these days.


User currently offlineSolnabo From Sweden, joined Jan 2008, 882 posts, RR: 2
Reply 3, posted (11 years 3 weeks 1 day 1 hour ago) and read 2231 times:

That will make it longer time in the cabin for pax. Wonder what they think?
The tickets has to be cheaper, true of false?

Hejdå Big grin

Airbus SAS - Love them both
User currently offlineSinlock From United States of America, joined Dec 2000, 1677 posts, RR: 2
Reply 4, posted (11 years 3 weeks 1 day ago) and read 2184 times:

I taking a guess here,

I'd take it that "Tankering" is an airline operating a flight taking a full load of fuel in order to avoid the higher fuel costs in other countries. I'd also the guess the same for return trips from places that have lower costs.

My Country can beat up your Country....
User currently offlineDbo861 From United States of America, joined May 2004, 958 posts, RR: 1
Reply 5, posted (11 years 3 weeks 22 hours ago) and read 2087 times:

The price for Auto gasoline is going down, is the price of Jet fuel forecast to go down?

User currently offlineBA From United States of America, joined May 2000, 11154 posts, RR: 58
Reply 6, posted (11 years 3 weeks 21 hours ago) and read 2056 times:

Every aircraft has an optimal cruise speed at different altitudes, temperatures, and other varying conditions.

When you fly above that optimal cruise speed, you lose fuel efficiency. When you fly below that optimal cruise speed, you will also lose fuel efficiency.

Many factors determine the aircraft's optimal cruise speed at the varying conditions, from the wing design, weight, etc.

Modern aircraft computers are capable of calculating the optimal cruising speed by taking into account the varying conditions, constantly following it and making any necessary adjustments.

I assume UA and other airlines will start following optimal cruise speeds more often now.


"Generosity is giving more than you can, and pride is taking less than you need." - Khalil Gibran
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