I usually get to my local airport 45 mins before it's due to depart as it's a small airport with only a few flights a day. Usually getting there at that time security takes 3 mins and then it's a 2 min walk to the gate. But they often say "only 15 mins until flight closes!" At security. I know they say the gate closes 30 mins before the flight takes off but literally every time I get there even for flights on time I still have a 30 min wait until the the line for the gate is empty before I have to stand up. What happens if I get there less than 30 mins before the flight is due to take off? Will they refuse me to pass security even though that's still loads of time and loads of time sat a around.