str(airlines)
## Classes 'tbl_df', 'tbl' and 'data.frame': 16 obs. of 2 variables:
## $ carrier: chr "9E" "AA" "AS" "B6" ...
## $ name : chr "Endeavor Air Inc." "American Airlines Inc." "Alaska Airlines Inc." "JetBlue Airways" ...
str(airports)
## Classes 'tbl_df', 'tbl' and 'data.frame': 1458 obs. of 8 variables:
## $ faa : chr "04G" "06A" "06C" "06N" ...
## $ name : chr "Lansdowne Airport" "Moton Field Municipal Airport" "Schaumburg Regional" "Randall Airport" ...
## $ lat : num 41.1 32.5 42 41.4 31.1 ...
## $ lon : num -80.6 -85.7 -88.1 -74.4 -81.4 ...
## $ alt : int 1044 264 801 523 11 1593 730 492 1000 108 ...
## $ tz : num -5 -6 -6 -5 -5 -5 -5 -5 -5 -8 ...
## $ dst : chr "A" "A" "A" "A" ...
## $ tzone: chr "America/New_York" "America/Chicago" "America/Chicago" "America/New_York" ...
## - attr(*, "spec")=List of 2
## ..$ cols :List of 12
## .. ..$ id : list()
## .. .. ..- attr(*, "class")= chr "collector_integer" "collector"
## .. ..$ name : list()
## .. .. ..- attr(*, "class")= chr "collector_character" "collector"
## .. ..$ city : list()
## .. .. ..- attr(*, "class")= chr "collector_character" "collector"
## .. ..$ country: list()
## .. .. ..- attr(*, "class")= chr "collector_character" "collector"
## .. ..$ faa : list()
## .. .. ..- attr(*, "class")= chr "collector_character" "collector"
## .. ..$ icao : list()
## .. .. ..- attr(*, "class")= chr "collector_character" "collector"
## .. ..$ lat : list()
## .. .. ..- attr(*, "class")= chr "collector_double" "collector"
## .. ..$ lon : list()
## .. .. ..- attr(*, "class")= chr "collector_double" "collector"
## .. ..$ alt : list()
## .. .. ..- attr(*, "class")= chr "collector_integer" "collector"
## .. ..$ tz : list()
## .. .. ..- attr(*, "class")= chr "collector_double" "collector"
## .. ..$ dst : list()
## .. .. ..- attr(*, "class")= chr "collector_character" "collector"
## .. ..$ tzone : list()
## .. .. ..- attr(*, "class")= chr "collector_character" "collector"
## ..$ default: list()
## .. ..- attr(*, "class")= chr "collector_guess" "collector"
## ..- attr(*, "class")= chr "col_spec"