Hi Ingo,
3C6440 unknown
3E24F5 D-IFER UNKNOWN TO ME
4007CC is G-BTXN B463 c/n E3129, Aviation Capital Solutions
4009FB was as you state G-EZJT but no more, unknown
British aircraft keep the same hex code for their lifetime on the British register, if the yare registered in the UK then sold abroad they get their original hex back on their return. The hex is never re-allocated to another aircraft.
50824A is thought to be UR-DAJ A320-232 c/n 760 but some confusion exists so confirmation awaited.
7806D9, B-6436, A319-115, c/n 4766, Tibet Airways
The other 2 Chinese unknown
Thanks again
Alan