between major airlines at CLT? This observational study examines - - PowerPoint PPT Presentation

Q: Are takeoff profiles different between major airlines at CLT?

This observational study examines entire month of July 2018 Total N= 1,172 flights One mile gate above Dave C. (one of our community presenters in August)

Conclusions

• 1. There were altitude differences between airlines.
• 2. Altitude differences were nested between aircraft models (Boeing,

Airbus, Bombardier).

• 3. Airbus is flown at lowest altitudes among aircraft models, and most

frequently.

• 4. Airbus has a distinct “whine” noise due to the wing design. Note:

there is a “fix” for the “whine”.

• 5. Respite (time) between flights were much less than expected, and

this observed “frequency” of noise events seems to corroborate community experience, despite what many have long believed.

4147 3443 3523 4529 4879 4281

2000 2500 3000 3500 4000 4500 5000 5500 American

• ther

American Airline Delta Southwest Fedex United Dave C. July 2018 Takeoff Altitudes in feet above ground level N=561 flights N=472 flights N=80 flights N=28 flights N=10 flights N=8 flights

205 195 168 133 121 73 59 40 35 31 31 22 15 11 50 100 150 200 250 Aircraft Type Count (N)

AC Type ABGL MD88 MD83 E75S E75L E190 E170 E145 E135 CRJ9 CRJ7 CRJ2 B738 B737 B712 A321 A320 A319 6000 5500 5000 4500 4000 3500 3000

Interval Plot of ABGL vs AC Type

95% CI for the Mean AA 162/168 AA 32/40 AA 66/73 SWA 29/31 AA 204/205 AAO 111/121 DAL 35/35 AAO 194/195 AAO 128/133

Count Date Count 57 55 50 49 48 48 43 40 26 49 129 Percent 11 9 8 8 7 6 6 5 5 106 5 4 4 4 4 4 3 2 4 Cum % 99 11 20 29 37 43 50 55 60 65 70 94 74 78 82 87 90 94 96 100 80 75 65 58 O t h e r 7 / 4 / 2 1 8 7 / 6 / 2 1 8 7 / 1 4 / 2 1 8 7 / 2 9 / 2 1 8 7 / 2 2 / 2 1 8 7 / 2 5 / 2 1 8 7 / 5 / 2 1 8 7 / 1 7 / 2 1 8 7 / 3 / 2 1 8 7 / 2 7 / 2 1 8 7 / 1 6 / 2 1 8 7 / 2 1 / 2 1 8 7 / 2 / 2 1 8 7 / 3 1 / 2 1 8 7 / 1 5 / 2 1 8 8 / 1 / 2 1 8 7 / 1 / 2 1 8 140 120 100 80 60 40 20

49 26 40 43 48 48 49 50 55 57 58 65 75 80 94 99 106 129

# Aircraft by Date

Zero aircraft flew over Dave C. on July 3, 7, 8, 9, 10, 11, 12, 13, 18, 19, 20, 28

1 4 6 3 5 12 16 8 2 10 16 7 17 2 10 2 7 July 1, 2018 aircraft count by hour of day

N umber of flights 240 210 180 150 120 90 60 100 80 60 40 20

Time in seconds between flights at Dave C.

One month of data showed 34 flights in less than a minute between (minimum of 46s) 306 flights were less than 2 minutes apart!!! Subsample below shows 555 flights out of a truncated time ordered distribution with a total sample size of N= 1172