Haven’t landed, they’ve been taken down. The one in Yehuda is the first to make it through. Iron Dome is 90% effective, fire enough, 10% will make it through. If the FAA is a responsible agency they knew the risk to planes on the ground a week ago, as did the airlines. The risk from the south ends not in 24 hours, but when the threat is eliminated. Since the threat won’t end in 24 hours, something else is at work. IMO, Kerry is delivering a clumsy threat, see what we can do. Not much different than lecturing Bibi on his, Kerry’s, combat experience and what he learned from it.
I can understand the difference between now ... and last week, though. That’s a big and important airport and one doesn’t want to be irresponsible and tell US planes they can’t go there, based upon speculation that something might get through (especially with the high rate of success with the Iron Dome).
But when something changes from speculation to “actually happening” ... then one acts. And 24 hours is reasonable to see of anything “actually happens” again. If not, then things can go on as before.
I would say that it is a very reasonable action.