# Is this BA15X flight a logistic flight for British Airways?

Right now (26/11/2015, UTC 17:16), British Airways is flying over the Australian Outback with two Boeing 777-336(ER)s, christened flight BA15 (http://www.flightradar24.com/BAW15/8169bb5) and BA15X, which is slightly ahead (http://www.flightradar24.com/BAW15X/8169237).

Why is this? Is flight BA15X a logistic one? And if not, why did they use an "X" to distinguish between the two instead of another number?

EDIT

I am also wondering: is this going to cost extra money to BA, owing to the new slot they had to purchase or rent for operating a contemporary, second aircraft at SYD?

• In the past, BA15X has been used to reposition aircraft after diversions or mechanical delays. See thebasource.com/… for an example. I suspect the X is used to differentiate it from the regularly scheduled flight operating at nearly the same time. Fascinating find. – user19474 Nov 26 '15 at 17:50

• Is this going to cost extra money to BA, owing to the new slot they had to purchase or rent for operating a contemporary, second aircraft at SYD? – FaCoffee Nov 27 '15 at 9:45