A local television station featured a story today about someone who booked a round trip United flight from Charlottesville, VA to Colorado Springs last July for travel on the Thanksgiving Holiday. Neither Hotwire or United notified her that her connecting flight in Dulles was discontinued in August.
Personally I prefer booking directly with the Airlines when making travel plans. Yesterday I received an email notice from Delta that an upcoming flight in March had changed and the new flight presented a conflict with my travel plans. I was able to contact Delta directly and able to change my flight without any issue.