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.

Dave C. July 2018 Takeoff Altitudes in feet above ground level 5500 5000 4879 4529 4500 4281 4147 4000 3523 3500 3443 3000 2500 2000 N=8 flights N=561 flights N=472 flights N=80 flights N=28 flights N=10 flights American American Delta Southwest Fedex United other Airline

Aircraft Type Count (N) 250 205 195 200 168 150 133 121 100 73 59 40 50 35 31 31 22 15 11 0

Interval Plot of ABGL vs AC Type 95% CI for the Mean 6000 5500 5000 AAO 194/195 ABGL 4500 AAO 128/133 SWA 29/31 4000 AA 162/168 AAO 111/121 3500 AA 32/40 AA 66/73 3000 DAL 35/35 AA 204/205 E75L A319 A320 A321 B712 B737 B738 CRJ2 CRJ7 CRJ9 E135 E145 E170 E190 MD83 MD88 E75S AC Type

# Aircraft by Date 140 129 Zero aircraft flew over Dave C. on July 3, 7, 8, 9, 10, 11, 12, 13, 120 18, 19, 20, 28 106 99 100 94 80 80 75 Count 65 58 57 60 55 50 49 49 48 48 43 40 40 26 20 0 Date 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 r e 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 h 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 t 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 O / / / / / / / / / / / / / / / / / 1 1 5 1 2 1 6 7 0 7 5 5 2 9 4 6 4 / / 1 3 / 2 1 2 3 1 / 2 2 2 1 / / 7 8 7 7 7 7 / / / / / / / / / / / 7 7 7 7 7 7 7 7 7 7 7 Count 129 106 99 94 80 75 65 58 57 55 50 49 48 48 43 40 26 49 Percent 11 9 8 8 7 6 6 5 5 5 4 4 4 4 4 3 2 4 Cum % 11 20 29 37 43 50 55 60 65 70 74 78 82 87 90 94 96 100

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

Time in seconds between flights at Dave C. 100 One month of data showed 34 flights in less 80 than a minute between (minimum of 46s) 306 flights were less than 2 minutes apart!!! umber of flights 60 Subsample below shows 555 flights out of a truncated time ordered distribution with a total sample size of N= 1172 40 N 20 0 60 90 120 150 180 210 240