As it stands.................
Currently still using MYT and TCX flight numbers during winter and from May 1st 2008 all flights will be on TCX flight numbers. A number of TCX aircraft (B757's) have transfered to the MYT AOC in the last few weeks the last being transfered in Feb.
Once all is complete the MYT AOC will then become the TCX AOC (all confusing i know but there are reasons behind it)
From what i can gather the "Topjet" callsign will remain however i have also heard a rumour that there maybe a new callsign so who knows?????