In doing some research about failed Hungarian carrier Malév, I came across this amazing video. On August 20, 2006 a Malév 737 followed by a Sky Europe plane flew at a low altitude over Budapest, Hungary. This ten minute video has some stunning view of this beautiful city. The two planes then flew side by side.
I assume it was done for the sixtieth anniversay of the founding of the successor to Malév.
Ironically, both airlines are gone now.