Join Date: Sep 2005
Location: HEL
Programs: AY Platinum, TK Elite, BT Executive, AA, BA, SK, DL, NT, WB + hotels
Posts: 10,241
There have been some reports, yes. It is sort of a semi-glitch because often they want to rebook you in Y. But if it shows J for you, it should stick. A friend of mine booked BER-HEL and upgraded with a voucher. The flight was retimed and he rebooked using the website to BER-LHR-HEL, all in J, no problems.