make sure that situation likes this don't happen again? i mean, hours of delays and thousands of people that don't have information about what's next for them. >> it's a little difficult to understand an airport that size which is the world's busiest airport at this point. it's a little difficult to understand why a backup system didn't cut in almost immediately. i understand there was a fire. i understand all that. but the backup systems if they're properly constructed in infrastructure are well separated from the main fire systems. i can think of a coupe of places where in the old standards before people really thought about it, you would have a backup power line rung alongside the main power line that doesn't work very well. if the main power blows up or is cut with a bomb or any other way, the backup power line is also banged up. i suspect that's what's happened here. i don't know. i don't know how old the infrastructure. in modern infrastructure, your