United 3759, a CRJ-700 operated by Mesa Airlines, made an emergency landing at New Castle County Airport in Wilmington, DE on 01/29/14 due to smoke in cabin. Audio is edited down to include only this flight and starts when asks for emergency descent while on Washington Center. Audio continues on Philadelphia Approach and stops when switches to tower frequency as tower frequency was down at the time. The audio ends with the radio transmissions of the fire department response.