We should leave for the airport by 3pm
6/6 parts
· complete
Grounds
Our flight boards at 6 p.m. and the drive plus security usually takes two hours.
Qualifier
To be safe
Claim
We should leave for the airport by 3 p.m.
Warrant
Arriving with a buffer avoids missing the flight.
Rebuttal (unless…)
Unless traffic is unusually light and we have no bags to check.
Backing
The airline recommends arriving at least two hours before an international departure.