The Monthly Average Flight Time:
A NAS Performance Metric
Mark Hansen
Helen Yin
1
Overview
‰ Monthly Average Flight Time is a NAS
(MAFT) performance metric that
reflects the flight time and its
components for an “average”
commercial passenger flight
‰ MAFT has been calculated for 19952005
2
Advantages of the MAFT
‰ Not affected by airline schedule
padding
‰ Apples-to-apples comparisons for trend
analysis
‰ Decomposable
‰By flight time component
‰By airport
3
location
MAFT and its Components
Dest. Gate
Dest. Runway
MAFT
MAOT
MAAT
MADT
MAGT=MAOT+MADT
Origin Runway
Origin Gate
time
Scheduled
Departure Time
Actual Departure Wheels-Off Time
Time
Wheels-On Time
Actual Arrival Time
4
Constructing the MAFT
‰ Based on ASQP data
‰Covers all flights by major pax carriers
‰Provides out-off-on-in times for domestic flights
‰ Weighted Average
‰Set of city pairs with at least 10 completed flights
in each month (1188 in present version)
‰Weights based on proportion of flights over entire
analysis period
‰Monthly average flight time calculated for each
od-pair
‰od-pair weights applied to determine overall
average
5
Weight Calculation
‰ Identify od-pairs for which there are at least
10 completed flights with valid data every
month
Fi
‰ Calculate weights as Wi =
Wi- Weight for od-pair i
∑F
j∈CP
j
Fi- Flights for od-pair j during study period
CP – Set of od-pairs in the MAFT
‰ Other weights can also be used
6
Airport
Destination Weights in MAFT Flight Basket (>1%)
0.07
0.06
Total Weight
0.05
0.04
0.03
0.02
0.01
0
A
T
L
D O
F R
W D
L
A
X
P
H
X
L
A
S
D D
T E
W N
S
F
O
M
S
P
S
E
A
S
T
L
I
A
H
M
C
O
C
L
T
S
L
C
S
A
N
O
A
K
E M
W I
R A
Destination Airport
P
H
L
S
J
C
L
G
A
T
P
A
H
O
U
P
D
X
D
A
L
M
C
I
S
M
F
S
N
A
F
L
L
M B
D O
W S
C
V
G
7
Monthly Average Flight Time, 1995-2005
150
145
140
MAFT (min)
135
130
MAFT
125
12 per. Mov. Avg. (MAFT)
120
115
110
105
100
J
a
n
9
5
J
u
l
9
5
J
a
n
9
6
J
u
l
9
6
J
a
n
9
7
J
u
l
9
7
J
a
n
9
8
J
u
l
9
8
J
a
n
9
9
J
u
l
9
9
J
a
n
0
0
J
u
l
0
0
Month
J
a
n
0
1
J
u
l
0
1
J
a
n
0
2
J
u
l
0
2
J
a
n
0
3
J
u
l
0
3
J
a
n
0
4
J
u
l
0
4
J
a
n
0
5
J
u
l
0
5
8
MAFT Air and Ground Components, 1995-2005
120
MAFT Component (min)
100
80
Air
Ground
60
12 per. Mov. Avg. (Air)
12 per. Mov. Avg. (Ground)
40
20
0
J
a
n
9
5
J
u
l
9
5
J
a
n
9
6
J
u
l
9
6
J
a
n
9
7
J
u
l
9
7
J
a
n
9
8
J
u
l
9
8
J
a
n
9
9
J
u
l
9
9
J
a
n
0
0
J
u
l
0
0
Month
J
a
n
0
1
J
u
l
0
1
J
a
n
0
2
J
u
l
0
2
J
a
n
0
3
J
u
l
0
3
J
a
n
0
4
J
u
l
0
4
J
a
n
0
5
J
u
l
0
5
9
MAFT Air, Origin, and Destination Components, 1995-2005
120
MAFT Component (min)
100
80
Air
Origin
Dest
60
12 per. Mov. Avg. (Air)
12 per. Mov. Avg. (Origin)
12 per. Mov. Avg. (Dest)
40
20
0
J
a
n
9
5
J
u
l
9
5
J
a
n
9
6
J
u
l
9
6
J
a
n
9
7
J
u
l
9
7
J
a
n
9
8
J
u
l
9
8
J
a
n
9
9
J
u
l
9
9
J
a
n
0
0
J
u
l
0
0
Month
J
a
n
0
1
J
u
l
0
1
J
a
n
0
2
J
u
l
0
2
J
a
n
0
3
J
u
l
0
3
J
a
n
0
4
J
u
l
0
4
J
a
n
0
5
J
u
l
0
5
10
MAFT Air Component, 1995-2005
105
104
MAFT Component (min)
103
102
101
Air
Ground
100
12 per. Mov. Avg. (Air)
12 per. Mov. Avg. (Ground)
99
98
97
96
95
J
a
n
9
5
J
u
l
9
5
J
a
n
9
6
J
u
l
9
6
J
a
n
9
7
J
u
l
9
7
J
a
n
9
8
J
u
l
9
8
J
a
n
9
9
J
u
l
9
9
J
a
n
0
0
J
u
l
0
0
Month
J
a
n
0
1
J
u
l
0
1
J
a
n
0
2
J
u
l
0
2
J
a
n
0
3
J
u
l
0
3
J
a
n
0
4
J
u
l
0
4
J
a
n
0
5
J
u
l
0
5
11
Monthly Average Flight Time and OAG Time, 1995-2005
150
145
140
MAFT (min)
135
130
MAFT
OAG
125
12 per. Mov. Avg. (MAFT)
12 per. Mov. Avg. (OAG)
120
115
110
105
100
J
a
n
9
5
J
u
l
9
5
J
a
n
9
6
J
u
l
9
6
J
a
n
9
7
J
u
l
9
7
J
a
n
9
8
J
u
l
9
8
J
a
n
9
9
J
u
l
9
9
J
a
n
0
0
J
u
l
0
0
Month
J
a
n
0
1
J
u
l
0
1
J
a
n
0
2
J
u
l
0
2
J
a
n
0
3
J
u
l
0
3
J
a
n
0
4
J
u
l
0
4
J
a
n
0
5
J
u
l
0
5
12