It looks like it's a single aircraft doing something like this every weekend:-
LCY-MAN THU 1945-2045
MAN-IBZ THU 2125-0115+1
IBZ-MAN FRI 0155-0340
MAN-AGP FRI 0535-0935
AGP-MAN FRI 1020-1225
MAN-JMK FRI 1310-1910
JMK-MAN FRI 1955-2205
MAN-ALC SAT 0550-0940
ALC-MAN SAT 1020-1225
MAN-NCE SAT 1305-1625
NCE-MAN SAT 1710-1835
MAN-IBZ SAT 1930-2320
IBZ-MAN SUN 0005-0150
MAN-PMI SUN 0550-0935
PMI-MAN SUN 1020-1205
MAN-IBZ SUN 1250-1640
IBZ-MAN SUN 1725-1910
MAN-LCY SUN 1955-2055