I think it's fair to say there has never been an accident that you can clearly say was caused by electromagnetic interference.

A laptop computer controlled the system and logged the data. While we looked primarily at wireless phones, we also discovered that emissions from other portable electronic devices were problematic. We feel that passenger use of portable electronic devices on aircraft should continue to be limited for the safety of all concerned.

We feel that passenger use of portable electronic devices on aircraft should continue to be limited for the safety of all concerned.

A laptop computer controlled the system and logged the data.

We're not saying we've got a crisis on our hands. We're just saying that, you know, as more and more wireless devices get on more and more airplanes, sooner or later we're going to have a problem.

A potentially useful property of forecasts based on cointegration is that when extended some way ahead, the forecasts of the two series will form a constant ratio, as is expected by some asymptotic economic theory.