Australian carrier Qantas and Singapore Airlines on Friday reassured passengers there was no risk to safety after cracks were found on the wings of several A380 superjumbos, including some in their fleets. Airbus revealed on Thursday that "minor cracks" had been found on some jets, but the European plane maker said they posed no safety problem and recommended a way they could be fixed. Qantas said the cracks had been found on one of its 10 A380s. "Minuscule cracking was found in the wing ribs of the Qantas A380 being repaired in Singapore," a Qantas spokesperson said in a statement....