Shares of Dollar Thrifty Automotive Group jumped 8 percent in after-hours trading Tuesday following a 14.8-percent profit surge by the struggling vehicle rental company. “Obviously investors were hungry for Dollar Thrifty,” said Tulsa securities analyst M. “Jake” Dollarhide, noting these shares have risen more than 1,100 percent this year. “They wanted to know not only if Dollar Thrifty would survive but whether they would do well against competitors. Obviously they’re giving investors exactly what they want to hear.” After Wall Street’s regular session closed, Tulsa-based Dollar Thrifty posted second-quarter net income of $12.4 million, or 55 cents per diluted share, up from $10.8 million, or 49 cents, the prior year.