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Airport tax - Understand amount

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Airport tax - Understand amount

Messagede flyingrooster2019 » Ven Juil 26, 2019 10:17

Hi – I am trying to understand how the Airport Tax is calculated. I always assumed it was the sum of [Airport Tax @ Hub] + [Airport Tax @ destination] (times 2) but that does not appear to be correct. When I look at the financial details of the flight (tycoon.airlines-manager.com/network/showflight/) I see other amounts at Airport Tax. Can someone explain how to the Airport taxes are calculated?

I fly LH routes and typically use 2 aircrafts (often different type) to match demand. One aircraft configured fully Eco the other aircraft for the rest (leaving some 1st class and cargo demand unused). On some routes the airport tax is the same for each aircraft, but for most routes the airport tax differs per aircraft. This really makes me wonder where Airport Tax is dependent on. Does anyone have any views?
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Airport tax - Understand amount

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Re: Airport tax - Understand amount

Messagede flyingrooster2019 » Ven Juil 26, 2019 13:50

OK – so I read somewhere that airport tax is dependent on [Aircraft category] and that seems to work. I arrive at the following formula to predict Airport Tax for any given route:

Airport Tax for a given route = [Airport Tax] x [Aircraft Category] / 2

[Airport Tax] refers to the Airport Tax of the destination airport as specified when buying a new route. The calculation seems to ignore the Hub Airport tax. That still sounds strange to me but perhaps the Hub Tax are reflected elsewhere

I’ve also managed to find the exact calculation to determine [Fuel cost] (happy to share if people are interested). The determination of [Other Cost] is more difficult so if people have any views let me know
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Re: Airport tax - Understand amount

Messagede Nikiton » Mer Juil 31, 2019 18:31

[Fuel cost] is easy: 0.01875*distance*consumption*actual payload in tons.
Payload is taken from aircraft config, and also equals 0.1 t for each [Economy] passenger delivered + 0.125 t for [Business] + 0.15 t for [First] + 1 t for [Cargo] (and don't forget to divide the flight's demand by 2 because of going back and forth).

[Other Cost] is harder to determine. I'm also working on it in these days. I know that it depends on how recent the aircraft model is - classic models like Concorde or Caravelle can make up to zero [Other Cost] while modern ones like A330-900 or B787-10 will be significantly more expensive.
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Re: Airport tax - Understand amount

Messagede flyingrooster2019 » Ven Aoû 02, 2019 13:41

Nikiton a écrit:[Fuel cost] is easy: 0.01875*distance*consumption*actual payload in tons.
Payload is taken from aircraft config, and also equals 0.1 t for each [Economy] passenger delivered + 0.125 t for [Business] + 0.15 t for [First] + 1 t for [Cargo] (and don't forget to divide the flight's demand by 2 because of going back and forth).
Thanks - I had roughly the same but yours reads more intuitive

Nikiton a écrit: [Other Cost] is harder to determine. I'm also working on it in these days. I know that it depends on how recent the aircraft model is - classic models like Concorde or Caravelle can make up to zero [Other Cost] while modern ones like A330-900 or B787-10 will be significantly more expensive.


Using the Linear Regression techniques I learned long time ago I arrived at the following formula. I have only tried linear regression and I think the real formula has some exponential elements in it. Nevertheless, my average error on my fleet is ~1% so I think I should be close. Here we go. Number between (parenthesis) are negative

[Ticket sales] * 0.2675
[Aircraft Pax Capacity] * (1,434.5017)
[Aircraft Purchase price] * 0.0027628
[Aircraft Year designed] * (145.5127)
[Aircraft Category] * 21,743.6201
[Fuel cost] * (0.0454)
[Pax carried in 1st Class on return (= 2x single leg)] * 592.0197
[Special Wear Ratio] * (3,818.7133)

[Special Wear Ratio] = For planes older than 2006 = 1/[Aircraft Wear %] ; For planes older than 2008 = zero / nothing

Note that this analysis was based on 10 Long-haul routes each flying 2 aircraft. I only use 5 different aircraft so this analysis is biased. However, let me know what you think
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Re: Airport tax - Understand amount

Messagede Nikiton » Sam Aoû 10, 2019 17:11

flyingrooster2019 a écrit:[Ticket sales] * 0.2675
[Aircraft Pax Capacity] * (1,434.5017)
[Aircraft Purchase price] * 0.0027628
[Aircraft Year designed] * (145.5127)
[Aircraft Category] * 21,743.6201
[Fuel cost] * (0.0454)
[Pax carried in 1st Class on return (= 2x single leg)] * 592.0197
[Special Wear Ratio] * (3,818.7133)

[Special Wear Ratio] = For planes older than 2006 = 1/[Aircraft Wear %] ; For planes older than 2008 = zero / nothing


Either the results are always much larger than I have in fact, or I didn't get how to use the formula. Anyway:

- [Special Wear Ratio] can't be 1/[Aircraft Wear %] because of dividing by zero when aircraft is new or after check A or D.
- Current Aircraft Wear % has no impact on [Other Cost] because [Other Cost] is the same in all identical consecutive flights, while Wear % is growing each time.
- [Ticket price] and [Ticket sales] have no impact on [Other Cost] because sometimes I add few $ to ticket prices to hold my remaining demands close to 0 (and still positive), and while it's the same demand on the same flight, it will be the same [Other Cost], even when if turnover is more than yesterday.
- I don't think there are exponential elements in real formula, but it can be somehow stepwise (like income tax calculation).
- For the time being I focus on determinating [Other costs] for single aircraft type (A380-800, because I mainly use it). When the result will look like [Calculation within single model]*[Specific Aircraft Coefficient], it will be much easier to determine the [Specific Aircraft Coefficient].

I suggest to try this one, it's not perfect, but gives less than 1% error to each side for my flights:
[Other costs] = [Specific Aircraft Coefficient]*[Distance]*(1.1177*[Eco]+0.9532*[Bus]+1.8688*[First]+7.9225*[Cargo]) - [Aircraft Price]*([Aircraft Year designed]-1987,6)*[Flight time]*([R&D Green Aviation Level]-1)*0.456097/1,000,000.

[Eco], [Bus], [First] and [Cargo] stand for persons/cargo carried physically back and forth, not for initial aircraft config.
[Specific Aircraft Coefficient] is going to be determined, for now following numbers can be used:
0.01507851 for A380-800,
0.018524 for B747-8I,
0.0161165 for B787-8,
and it's not working for my B747-400 flights (I guess older planes have some differences in calculations).

Also, I think that in the first half of the formula [Flight time] has to be taken into account in addition to (or instead of) flight distance.
[Expenses] from staff and R&D bonus should be taken into account as well (mine is currently 325 in total).

Second half of the formula reflects [Other costs] change over the [R&D Green Aviation] level growth, and is exact for all aircraft tested (A380-800, B747-8I, B787-8 and B747-400) for [Expenses] value 325.
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Re: Airport tax - Understand amount

Messagede flyingrooster2019 » Mer Sep 25, 2019 19:54

Nikiton a écrit:
flyingrooster2019 a écrit:- [Special Wear Ratio] can't be 1/[Aircraft Wear %] because of dividing by zero when aircraft is new or after check A or D.


Thanks. What I meant to refer to is the % of wear per 100hrs of flight. This is a static value and different for each aircraft. Can you share the Aircraft co-efficients that you use?
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