Originally Posted by corporate-wage-slave

By buying separate reservations you take on a number of risks, notably weather. You are flying from the airport with probably the second worst weather record in March, to the airport with the worst weather record. Three hours is usually fine, and 80% of the time it will be a stress free exprience, so it depends on the implications to you if you had to buy a new ticket to DFW or not - many people can live with the 20% risk, others would be mortified by the prospect. It may be that your BA ticket can be moved for relatively little money via MMB, so long as it was a clean BA.com purchase for a commercial ticket. You probably need to look at the weather forecast on Thursday evening to see how things are going, until then weather forecasts won't be that accurate. The thing you can do at this point is consider what your Plan B would look like.