O'Hare is Chicago's main airport, on the northwest side of the city. On tickets the code is ORD. Learner dictionaries often call it the busiest airport in the United States. That used to be a fair boast, and it is still one of the very busiest — huge, crowded, a place where many people change planes — but which airport sits at number one moves around from year to year; Atlanta often takes the passenger crown. People say “We fly into O'Hare” the way we say “We fly into Taoyuan”: the name of the place, not a person. Though actually, the three letters on your ticket are ORD, from an older field name, Orchard, not from O'Hare at all. The airport was named after Edward “Butch” O'Hare, a US navy pilot. The family name is Irish: Ó hAichir, “descendant of Aichear”, a byname from aichear, “sharp, keen”.