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| # Combining tests using boolean operators | |
| # All flights that departed before 5am or arrived after 10pm | |
| filter(hflights, DepTime < 500 | ArrTime > 2200 ) | |
| # All flights that departed late but arrived ahead of schedule | |
| filter(hflights, DepDelay > 0 & ArrDelay < 0) | |
| # All cancelled weekend flights | |
| filter(hflights, DayOfWeek %in% c(6,7) & Cancelled == 1) | |
| # All flights that were cancelled after being delayed | |
| filter(hflights, Cancelled == 1, DepDelay > 0) |
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