Fatto generale: 15311 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 15311 is a boring number.
Trivia: 15311 is an unremarkable number.
Data storica: December 1st is the day in 1969 that the first legislation to limit aircraft noise levels at airports is introduced in U.S. Federal Air Regulation, Part 36.