Here's the problem: When the third runway is built and planes have to land in bad weather, the airport would use the new runway and the first runway, which is right next to the new tower. But, the tower is too tall to allow some planes to land on the first runway in bad weather. The FAA thinks it can fix that.

Meanwhile, air traffic controllers love the design of their new place. They say they sit in the best tower in the country. They have advanced technology at their fingertips and the best view in the world.

"It's a great place and the visibility and the view of Puget Sound and this beautiful area in which we life is just phenomenal," said Air traffic controller and union president Brian Schimpf.

But, KOMO 4 News has learned that under certain extreme weather situations where visibility is low, the tower could be a hazard for incoming aircraft should they miss their approach and need to go around.

"Of course we're concerned," said FAA Terminal Services Vice President Bruce Johnson. "We have a group in our flight standards division that is actually working on that as we speak. We should have solution for that probably by the end of June."

The FAA says when the tower was designed, the flight safety folks said it was OK and issued waivers for its location and its height.

"Then after we got it basically built and they went back and did the final scrub on it, they said we're a little too tall," Johnson said. "That's when we went to work and started looking at what we could do to mitigate that."

U.S. Senator Patty Murray is asked, "You worried that this was put in the wrong spot?" Murray says, "No, they got a waiver originally and they are looking at what it may mean and my understanding is that it's a very, very narrow exception that will affect very few flights."

What about the air traffic controllers? They're the ones sitting so vulnerably high in the sky.

"I know there's some concern around it and I'm glad they're looking into it and we'll stay on top of it to make sure that things are done correctly," Schimpf said.

Tower operations supervisor Laurence Randolph, Jr. says, "I don't think that it's too tall because the way the technology is moving, they'll find a way to straighten that approach out."