I believe another airline has already taken the Thomson callsign!
Really? Tomjet sounds awful. mind you TUIair was as bad. A callsign needs to have no relation with the branding whatsoever.
flybe = "Jersey" from Jersey European
BA = "Speedbird" from BOAC
Thomas Cook = "Kestrel" from the 1991 Airtours business
Jet2 = "Channex" from Channel Express
Why on Earth did they change from "Thomson" given there was never a need to change from "Britannia"?