Usually with international flights they say three hours before your flight, two hours for domestic flights :)
The recommended time is 2 hours prior to a domestic departure, 3 hours prior for an international departure.
It does depend a little on what time of the day your flight is but for the most part security is quite efficient there and an hour and a half works most of the time
I agree with Johnny Bravo. You never know what check in and security line up is like.
I agree with James Hey.
3 hours works.
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