Trucking company YRC Worldwide Inc swung to a small profit in the fourth quarter as operating revenue in its regional transportation business rose 10 percent, sending its shares up about 7 percent in premarket trading. Revenue for the quarter ended Dec. 31 rose 3 percent to $1.21 billion from a year earlier. The company earned $400,000 in the quarter, compared with a net loss of $35.3 million a year earlier. On a per-share basis, net loss narrowed to $1.71 from $4.53. YRC’s shares closed at $22.63 on the Nasdaq on Wednesday.