Originally Posted by fly747first

Given your LH F segment, I'm assuming this is for a trip within 14 days. Thai has a tendency to severely overbook its J and Y classes since there is little demand for its F. Also, Thai is infamous for last-minute equipment changes, so yes, technically there is a chance you may be downgraded if the equipment goes from A380 (with 12 F seats) to B744 (depending on the configuration, TG has either 9 or 10 F seats). If in the worst case scenario this ends up happening, you can request to be put in F on another airline... I'd recommend Emirates since it has an amazing A380 F class, though TG may try to push a Star Alliance partner, and SQ also has an excellent F product.