American Eagle E145 near Cedar Rapids on Jan 10th 2014, banging noises in cockpit

An American Eagle Embraer ERJ-145, registration N674RJ performing flight MQ-3111 from Madison,WI to Dallas Ft. Worth,TX (USA), was climbing through FL210 out of Madison when the crew reported banging noises in the cockpit and requested to divert to Cedar Rapids,IA (USA), where the aircraft landed safely about 30 minutes later.

A passenger reported that maintenance came aboard and worked on the aircraft, a number of passengers were subsequently offloaded with the rest remaining on board, then the aircraft departed again and reached Dallas with a delay of 5.5 hours.