for accommodation for you. passengers are being told to check the status of their flight before heading to the airport. and there will now be questions asked about how today s outage could have happened. katie austin, bbc news. let s speak now to the independent travel expertjill sta rley grainger. good morning to you. do we know any more about what caused this yet? any more about what caused this et? , ., ., , ., yet? they have not explain exactly what yet? they have not explain exactly what caused - yet? they have not explain exactly what caused it - yet? they have not explain exactly what caused it but| yet? they have not explain - exactly what caused it but they have ruled out terrorism does seem like it is reallyjust a technical issue. they are investigating so we will know more in due course. the timing couldn t be more in due course. the timing couldn t be worse, more in due course. the timing couldn t be worse, a more in due course. the timing couldn t be worse, a night