On this snapshot the most senior UAL new hire can hold

IAH 737 at 59%
IAH 756 at 71%

EWR 737 at 59%
EWR 756 at 74%

LAX 737 at 71%

ORD 737 at 71%

DEN 737 at 89%

CLE 737 at 85%

GUM 737 at 58%