putting a restriction for eastern ukraine, it is a little proform ma, because obviously flights are avoiding the area, but again, it is up to each country, it is up to each government, and now all of european officials the air traffic control folks in europe are saying we are routing planes away from eastern ukraine. joining us is aviation expert, and retired commercial airline pilot. appreciate your being back with us, what do commercial aircraft pilots know in these situations? do you have a sense of warning in do you have an understanding of what might be targeted a commercial airliner. >> well, we do get advisories. there are -- i would say three possibilities. one, where there is no threat, we choose our routs accordingly. just the shortest rout. the second, would be the other extreme, where this is a warning do not fly into this area, you may be fired upon, and then we will avoid an area like that. what you have here is something of a gray area, not unlike what the u.s. faces when we have flights go from miami, said, over cuba. in order to land in jamaica. what usually happens in those