Topic Author
Posts: 17
Joined: Fri Nov 01, 2013 11:51 am

Fuel Exp Per ASK Vs Stage Length

Tue Nov 05, 2013 1:18 pm

Hi guys,

I was graphing fuel exp per ASK (y-axis) vs avg kilometers flown (x-axis) for both PGSUS AND THY. There's a strong negative correlation for PGSUS whereas a strong positive correlation for THY. What does that tell? Is it about being a LCC?
I thought the usual one is a negative correlation.

What do you think? Thanks in advance.
Posts: 1144
Joined: Mon Jun 18, 2001 8:31 am

RE: Fuel Exp Per ASK Vs Stage Length

Tue Nov 05, 2013 4:20 pm

Try comparing other LCC (vs. PGSUS) and legacy (vs. THY). IMHO looking at two different airlines will not give you proper output (value-added).

Quoting ptahturan88 (Thread starter):
I thought the usual one is a negative correlation.

Why should the fuel expense decline with increased avg. km flown fuel?

I would also look at ASKM/RSKM vs. Fuel Exp. ASK (does/what is the relationship between the fuel expense increases vs. (increased) ASKM and RSKM).


Posts: 6465
Joined: Wed Aug 29, 2001 8:47 pm

RE: Fuel Exp Per ASK Vs Stage Length

Wed Nov 06, 2013 5:25 am

OK, what aircraft ? 737NGs I assume?
It does have to do with:
1. Their speed/cost index policy
2. Their 1st choice altitude policy
3. Payloads
4. Holding & Alternate policy

That, gives you the fuel burn in kg/km...
Now, then we go to:
5. Where and who do they buy fuel from? (vendor pricing policy)
6. Do they conduct tankering (this reflects on effects of #3 and #4)
(and the list goes on)

If this is not aircraft type specific, THY's diverse fleet would give that positive correlation instead of a negative one, as with widebodies, the difference in fuel burn per hour changes a lot throughout the whole flyable grossweight change... etc etc etc...
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