No, no, no!
Santa's callsign would just be 'Santa'.
'Tower, good afternoon, Santa 1303 with you, ready for departure from 09R'.
'Santa 1303, good afternoon. After the Reindeer 737 has departed, line-up and wait 09R, Santa 1303'.
'Tower, Santa 1303'.
'Santa 1303, go ahead'.
'After which Reindeer 737 are we meant to line-up?'
'The Reindeer 737 with the red nose'.
'Roger, after the Reindeer 737 with the red nose, cleared to line-up and wait 09R, Santa 1303'.
'Santa 1303, the surface wind 336 7 kts, cleared for takeoff 09R'.
'Cleared for takeoff 09R, Santa 1303'.
'Santa 1303, contact London on 123.45'.
'London 123.45, Santa 1303. C ya next Christmas'.
Has a certain ring to it, eh? Hmm. I need to get out more. :-P
"Everyone writing for the Telegraph knows that the way to grab eyeballs is with Ryanair and/or sex."