confirmed air tickets

Hi, I work for an airline and I'm 'waitlisted' ie standby - chances of me leaving china 100% but it may not be the day I want
The L type requirement looks to be confirmed air ticket + confirmed hotels OR letter of invitation. I have letter from tour company but it only covers part of my stay ...help!
Is it best to match my visa application with the letter and say I'm leaving earlier.

Gosh I hope this works out I've paid $5000 for the tours!