In this amazing story ,after losing all hydraulic power of the aircraft , Captain Al Haynes guided the plane to the Sioux city, crashed but saved 185 of the 296 lives (United Airlines Flight 232-Sioux City, 1989). After this incident, NASA started to work on PCA systems. Gordon Fullerton landed an F-15, using only engine power. How did the F-15 land while the airliner crashed? Since an airliner and a fighter jet have different engine positions honestly it would make more sense to me if the airliner made it to the ground but fighter couldn't because it has relatively greater distance between engines, so better capability of yawing and as a result of having a shorter wingspan a fighter needs to fly faster to stay airborne. I understand the weight difference, i understand the possibility of adverse weather conditions during 232 flight, but i still don't get how a fighter is more capable than an airliner.
Some airliners have in fact landed more or less successfully using only engine power for control. The 2003 DHL attempted shootdown incident is an example.
A major difference between United 232 and Fullerton's landings you cite is that Fullerton was working for NASA testing a system designed specifically for the purpose of assisting pilots in controlling an aircraft with power alone. United 232 had no such system. See https://www.nasa.gov/centers/armstrong/news/FactSheets/FS-041-DFRC.html