All day I have been trying to research return airfares on the BA website for JFK to LHR in January. And all day I have been taken to a screen which tells me the dates I have given are invalid(they aren’t) and when I try to change the dates it keeps giving me dates for June 1969!!!! And that’s all!And no prices. I Have also called BA numerous times but no one has been able to offer a solution or explain why this is happening. It has never happened to me before. I have tried using both safari and Firefox with the same bad results. Has anyone else encountered this?