a380900
Topic Author
Posts: 801
Joined: Fri Dec 05, 2003 11:26 pm

How Many Planes Are Required To Fly A Destination

Sun May 12, 2013 12:00 am

How many planes of one type are required to fly a round trip 7 days a week to a destination that is 4000NM away? 7500NM? I wonder... What are the parameters?
 
apjung
Posts: 95
Joined: Mon Aug 12, 2002 3:20 pm

RE: How Many Planes Are Required To Fly A Destination

Sun May 12, 2013 12:08 am

I would say at least 3 (ie. SFO-TPE-SFO on UA when the route resumes in June 2014)
Andy P. Jung
 
BMI727
Posts: 11175
Joined: Mon Feb 02, 2009 9:29 pm

RE: How Many Planes Are Required To Fly A Destination

Sun May 12, 2013 12:16 am

Quoting a380900 (Thread starter):
What are the parameters?

If you can make the round trip in less than 24 hours you need one plane. 24-48 needs two planes, which of course ignores maintenance requirements. That said, rotating planes around can be far more efficient. For instance, you wouldn't have a plane returning from a 30 hour round trip sit around for 18 hours until it leaves again, you'll send it somewhere else. (Not that some planes don't sit for long periods of time, but they are usually undertaking some maintenance during the downtime)
Why do Aerospace Engineering students have to turn things in on time?
 
apjung
Posts: 95
Joined: Mon Aug 12, 2002 3:20 pm

RE: How Many Planes Are Required To Fly A Destination

Sun May 12, 2013 3:55 am

Quoting apjung (Reply 1):

Correction, I meant March 31, 2014.
Andy P. Jung
 
babaero
Posts: 416
Joined: Mon Jan 28, 2002 4:39 am

RE: How Many Planes Are Required To Fly A Destination

Sun May 12, 2013 9:57 am

When CX first launched HKG JFK non stop before the 777ERs arrived, they had and only need three A340-600s to maintain a daily service
 
rutankrd
Posts: 2653
Joined: Mon Sep 08, 2003 6:08 am

RE: How Many Planes Are Required To Fly A Destination

Sun May 12, 2013 10:14 am

Distance is not really the criteria but rather block times plus maintenance down time and rotation through the network.

A further consideration are the terminals at each end slot restricted or curfew restricted.

Simplistically speaking any route that cycles over 24 hours will require more than one frame allocation by definition.

Routes between 12 -24 hour might be operable with a single frame however more commonly two aircraft will be cycled on a long and mid haul route combination.

Over 28 hour (Basically Europe- Antipodes) needs a minimum of 3 frames however in reality you would require a further frame for downtime and again rotating over a shorter intermediate route.
 
vv701
Posts: 5805
Joined: Fri Aug 19, 2005 10:54 am

RE: How Many Planes Are Required To Fly A Destination

Sun May 12, 2013 11:10 am

LHR-BOM is 3,899 nm on the great circle route. BA's 10:55 LHR departure for BOM arrives at 00:35. The return flight departs at 02:35 and arrives back at LHR at 07:30, 3hrs and 25 mins on the clock before its original departure time. So one aircraft could operate this near 4,000 nm flight six days a week (leaving a day for routine maintenance).
 
PA515
Posts: 951
Joined: Tue Nov 06, 2007 6:17 am

RE: How Many Planes Are Required To Fly A Destination

Sun May 12, 2013 11:29 am

Quoting rutankrd (Reply 5):
Over 28 hour (Basically Europe- Antipodes) needs a minimum of 3 frames however in reality you would require a further frame for downtime and again rotating over a shorter intermediate route.

  
That's how the Air NZ fleet of five 77W's is used:
AKL-LAX-LHR-LAX-AKL (Daily) NZ2/NZ1 (3 aircraft)
AKL-LAX-AKL (ex Tue) NZ6/NZ5 (2 aircraft) -- Tue is a 77E

Aircraft dep AKL in the evening and return in the morning three/two days later. Downtime available is Tue morning to Thu evening. Two aircraft at AKL each morning doing an AKL-BNE-AKL, AKL-MEL-AKL or AKL-NAN-AKL most days before heading back to LAX that night.

Next year the fleet increases to seven 77W's with the 744 replaced AKL-SFO-AKL (Daily or ex Tue) NZ8/NZ7 (2 aircraft).

PA515
 
mandala499
Posts: 6460
Joined: Wed Aug 29, 2001 8:47 pm

RE: How Many Planes Are Required To Fly A Destination

Sun May 12, 2013 11:57 am

4000NM? I'm assuming that's air distance... in still air it would be Give and take 9H30 to 10hrs... so that's 20hrs return plus 2 hours on each end... so that makes it 1 aircraft...
But when you add maintenance, slots etc, 2 is the minimum, mix it with another shorter route.

7500NM? You'll need 2 minimum, most likely 3... if nonstop. If not, then 3 minimum...

So have all the above, then add timezone differences, airport operating hours, slot availability, etc... and it would screw up the above numbers   
When losing situational awareness, pray Cumulus Granitus isn't nearby !
 
roseflyer
Posts: 9606
Joined: Fri Feb 13, 2004 9:34 am

RE: How Many Planes Are Required To Fly A Destination

Sun May 12, 2013 3:46 pm

Most airlines don't operate their planes on isolated routes. The airplanes usually freely rotate throughout the network. So while if the block time is under 10 hours, it could only require 2 planes, technically it isn't a one for one relationship. Maintenance needs some extended ground time once a week and then more significant maintenance every two or three months.

When an airline adds a route they look at their spare aircraft, downtime and extended ground time to see how to schedule the flight. The more time the plane is in the air, the poorer the reliability. Each airline is different.
If you have never designed an airplane part before, let the real designers do the work!
 
Viscount724
Posts: 19287
Joined: Thu Oct 12, 2006 7:32 pm

RE: How Many Planes Are Required To Fly A Destination

Mon May 13, 2013 12:09 am

Quoting Roseflyer (Reply 9):
Most airlines don't operate their planes on isolated routes. The airplanes usually freely rotate throughout the network.

Example of routing of one AC 77W (C-FITU) since April 30 from Flightradar24:

YYZ-PVG-YYZ-CDG-YUL-CDG-YYZ-PEK-YYZ-CDG-YUL-CDG-YYZ-CDG-YUL-CDG-YYZ-PEK-YYZ-CDG-YUL-FRA-YYZ-NRT-YYZ-LHR

Who is online

Users browsing this forum: 26point2 and 10 guests

Popular Searches On Airliners.net

Top Photos of Last:   24 Hours  •  48 Hours  •  7 Days  •  30 Days  •  180 Days  •  365 Days  •  All Time

Military Aircraft Every type from fighters to helicopters from air forces around the globe

Classic Airliners Props and jets from the good old days

Flight Decks Views from inside the cockpit

Aircraft Cabins Passenger cabin shots showing seat arrangements as well as cargo aircraft interior

Cargo Aircraft Pictures of great freighter aircraft

Government Aircraft Aircraft flying government officials

Helicopters Our large helicopter section. Both military and civil versions

Blimps / Airships Everything from the Goodyear blimp to the Zeppelin

Night Photos Beautiful shots taken while the sun is below the horizon

Accidents Accident, incident and crash related photos

Air to Air Photos taken by airborne photographers of airborne aircraft

Special Paint Schemes Aircraft painted in beautiful and original liveries

Airport Overviews Airport overviews from the air or ground

Tails and Winglets Tail and Winglet closeups with beautiful airline logos