Assignment5

1. join + filter - Which airplanes fly LGA to XNA (1 POINT)

q1 <- flights %>%
  filter(origin =="LGA", dest=="XNA") %>%
  inner_join(planes, by = "tailnum") %>%
  select(tailnum, manufacturer, model) %>% 
  distinct()
head(q1)

## # A tibble: 4 × 3
##   tailnum manufacturer         model      
##   <chr>   <chr>                <chr>      
## 1 N711MQ  GULFSTREAM AEROSPACE G1159B     
## 2 N737MQ  CESSNA               172N       
## 3 N840MQ  CANADAIR LTD         CF-5D      
## 4 N713EV  BOMBARDIER INC       CL-600-2C10

2. join - Add the airline name to the flights table (1 POINT)

q2 <- flights %>%
  left_join(airlines, by = "carrier") 
head(q2)

## # A tibble: 6 × 20
##    year month   day dep_time sched_dep_time dep_delay arr_time sched_arr_time
##   <int> <int> <int>    <int>          <int>     <dbl>    <int>          <int>
## 1  2013     1     1      517            515         2      830            819
## 2  2013     1     1      533            529         4      850            830
## 3  2013     1     1      542            540         2      923            850
## 4  2013     1     1      544            545        -1     1004           1022
## 5  2013     1     1      554            600        -6      812            837
## 6  2013     1     1      554            558        -4      740            728
## # ℹ 12 more variables: arr_delay <dbl>, carrier <chr>, flight <int>,
## #   tailnum <chr>, origin <chr>, dest <chr>, air_time <dbl>, distance <dbl>,
## #   hour <dbl>, minute <dbl>, time_hour <dttm>, name <chr>

3. join + select + distinct() - Which airports have no commercial flights (1 POINT)

q3part1 <- flights %>%
  select(origin, dest) %>%
  pivot_longer(cols = c(origin, dest), values_to = "faa") %>%  
  distinct(faa)
q3part2 <- airports %>%
  anti_join(q3part1, by = "faa") %>%  
  select(name) 
head(q3part2)

## # A tibble: 6 × 1
##   name                          
##   <chr>                         
## 1 Lansdowne Airport             
## 2 Moton Field Municipal Airport 
## 3 Schaumburg Regional           
## 4 Randall Airport               
## 5 Jekyll Island Airport         
## 6 Elizabethton Municipal Airport