2024 AAU Nationals, Flight 337(14u girls) ran  

These girls dropped 11 seconds in 24 hours. They went from 4:28 in the prelims to 4:17 in the finals.
1st leg-Christiana McNeal(1:06), 2nd leg-Aralouwa Akinfenwa(1:04), 3rd leg-Isabella Osborne(1:05), 4th leg-Bella LeFang(1:02).