Having attempted for several times, Spanish amateur astronomer Javier Carrillo eventually captured the view of an aircraft flying across the frame of a solar H-alpha image.
Javier also put this video on Youtube so that we can see the clip easily in the browser:
Here is what he wrote in the mail:
My name is Javier Carrillo, and I'm a user of The Imaging Source cameras from Torrejon de Ardoz (Madrid), Spain. After some attempts, I have reached the goal of capture a plane crossing the Sun, with the help of a DMK 41AU02.AS. At last I have done!!
Telescope Orion eon 72mm and solar filter LS50F with the camera at primary focus, an IR cut filter.
Many Thanks Javier!