It's a bit rich asking someone for unequivocal proof when you admit you can't provide any to the contrary.
Not at all. LAX_LHR is saying that he/she does not have positive proof either way, whereas Ametyst1 is saying
Yes, I do known that 100% and yes, it was Manchester chasing Wizz Air.
Just advise us all how you can be so certain and we will all move on.