CHC Helicopter says the U.S. private equity firm First Reserve has agreed to push back the date for closing its buyout of the operator to the end of July. The February agreement between the firms, which calls for a buyout of Vancouver, British Columbia-based CHC valued at up to $3.7 billion, permits that date to be pushed back as far as Nov. 19. The takeover is subject to regulatory reviews in Canada and Europe. For related news