as they come in, she's behind them. what they told the first lady's plane, as we're understanding from "the washington post" here comes the cargo plane, you're too close behind it, do a series of s turns. that would add distance and slow the plane down. after doing that, they still didn't have enough separation. this one was still coming in. the worry was, when this one landed, even if there was not a turbulence problem, it wouldn't be able to get off the runway. we know that a 737 can cruise comfortably around 500 miles an hour, it would be slower than that coming in to land. if you just do the math, if this plane hits the runway, another plane is coming in at 500 miles an hour. that means it would cover the distance from the time this landed. if this is four miles or so,it's going to cover that distance in a half a minute. which only gives us 30 seconds to get up here and get off before this one lands. that seems to be the issue here.