1.2

nycflights13::flights
filter(flights,arr_delay>120)
filter(flights, dest=="IAH"|dest=="HOU")
filter(flights, carrier %in% c("AA", "DL", "UA"))
filter(flights, month >= 7, month <= 9)
filter(flights, arr_delay > 120, dep_delay <= 0)
filter(flights, dep_delay >= 60, dep_delay - arr_delay > 30)
summary(flights$dep_time)