Ryanair is to be subject to investigation by the Office of Fair Trading (OFT) regarding its stake in Aer Lingus. The airline started to build its 29.8 percent in the rival carrier in 2006. Ryanair has claimed that an inquiry cannot be held within four years, but the OFT said it has been given the go-ahead. “We have considered this issue carefully and it is appropriate and fair to Ryanair to inform them, at this point, that we believe we are ‘in time’ to review the minority stake,” said Sheldon Mills, director of mergers at the OFT told the Guardian. Ryanair said it would appeal the decision, which could lead to a formal Competition Commission probe.