3.2 A320 Family
As dealt with for the A300 and A310, we obtain the following cost ranges for the A320 family :
3 < Hourly maintenance cost < 7 (US$/min)
+ 5 < Crew cost < 10 (US$/min)
8 < Time-related cost < 17 (US$/min) NB : Crew composition = 2 cockpit crews + 5 (± 1) cabin crews.
Table 2. A319/A321 cost index
(kg/min)
TIME COST (US$/min) FUEL COST (US$/USG)  LOW < 10  MEDIUM 10 < to < 15  HIGH > 15 
LOW < 0.7  40  60  80 
MEDIUM 0.7 <    < 0.9  30  45  60 
HIGH > 0.9  25  40  50 

3.3 A330/A340 Family
In a first approximation, costs are judged to be identical for both models : flight crew, cabin and airframe maintenance costs being the same, engine maintenance costs are estimated similar on the big twin and on the quad.
The following brackets result from this :
10 ≤ Crew cost ≤ 20 (US$/min)
+7 ≤ Maintenance cost ≤ 17 (US$/min)
17 ≤ Time-related cost ≤ 37 (US$/min) NB : Crew composition = 2 or 3 cockpit crews + 10 (± 2) cabin crews.
Table 3. A330/A340 cost index
(kg/min)
TIME COST (US$/min) FUEL COST (US$/USG)  LOW < 20  MEDIUM 20 < to < 30  HIGH > 30 
LOW < 0.7  90  110  130 
MEDIUM 0.7 <    < 0.9  70  100  120 
HIGH > 0.9  60  80  100 

Reflecting realistic costs, these indices represent typical values that were prevailing in the industry for both the A330 and A340 aircraft types.
Although still valid for the ECON speeds of the A330, new definitions had to be adopted for MRC and LRC speeds on the A340 which lead, respectively, to Tables 4 (A340-211/311) and 5 (A340-213/313) for FMS Load 6. Pending Load 7, Tables 4 and 5 will become obsolete and Table 3 will prevail for both the A330 and A340.

Table 4. A340 cost index
A340-211 / CI FMS (L5)
A340-311 / CI FMS (L6)

(kg/min)
TIME COST (US$/min) FUEL COST (US$/USG)  LOW < 20  MEDIUM 20 < to < 30  HIGH > 30 
LOW < 0.7  150  180  200 
MEDIUM 0.7 <    < 0.9  130  160  180 
HIGH > 0.9  110  140  160 

Table 5. A340 cost index
A340-313 / CI FMS (L6)

(kg/min)
TIME COST (US$/min) FUEL COST (US$/USG)  LOW < 20  MEDIUM 20 < to < 30  HIGH > 30 
LOW < 0.7  180  240  270 
MEDIUM 0.7 <    < 0.9  160  200  240 
HIGH > 0.9  140  180  210 
　
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