CHC Group, the world’s largest commercial operator of helicopters, filed on Thursday with the SEC to raise up to $400 million in an initial public offering. The Richmond, Canada-based company, which was founded in 2008 and booked $1.7 billion in sales for the 12 months ended July 31, 2013, plans to list on the NYSE but has yet to announce a ticker. J.P. Morgan, Barclays and UBS Investment Bank are the joint bookrunners on the deal. No pricing terms were disclosed.