AI don't know if I'd classify this as a disaster but I just flew cross country with an 8" fondant ruffle cake that's going to be the top of a cupcake tower for a friends wedding. The ruffles survived but the smooth fondant on top cracked, I think front the impact on landing. Is there any way to save it? It will most likely be covered with rose petals, but just knowing it's there...suggestions?

You can make a paste out of the same coloured fondant and water and try to fill it in - should be the consistency of thick royal icing, pipe it over the crack and smooth with a small spatula, damp finger, or damp paintbrush. You can do a couple of layers leaving to dry between each. Depends on how wide the crack is. If it is hairline or just a bit larger, this will work. If you could slot a coin in there, it will notice too much and you'd just be better covering with petals as you say. 

You can also use buttercream to fill it in if it's the same color or close enough.

AI've used royal, tinted to match, works great for little 'out of the way' cracks.

AWhat causes fondant to crack?