Certainly had structural problem with the 707. Dan Air 707 had the right stabiliser and elevator come off during an approach. All six killed. Report finding,
It was determined that the structure of the right horizontal stabiliser failed due to metal fatigue in the rear spar structure, and due to the lack of an adequate fail-safe structure or device should such an event occur. The investigation also identified deficiencies in the assessment of aircraft designs and their certification and in the way aircraft were inspected.
The last sentence is rather telling. Inspections found 38 aircraft with similar cracking.