Wrangling Exercise

This is an exercise on data wrangling using the flights dataset:

library(tidyverse)
library(nycflights13)
data(flights)
data(airlines)

1. Filter flights to include only flights with an arrival delay greater than 2 hours (delays are recorded in minutes)
   

2. Select columns in the flights table that contain delay times (note that the function matches can be used to select columns with names that matches a regular expression. See ?dplyr::select)

3. Find the minimum arrival delay (this can be a negative number) in the flights table. Use summarize.

4. Find minimum arrival delay (again, can be a negative number) in the flights table for each destination airport. Use group_by' and 'summarize.

5. List the name of all airlines and the number of flights for each airline in flights table. The airlines table has airline names.