Airline stocks slid Monday as investors worried about a rebound in crude oil prices.

The Amex Airline Index was down 1.4%. Shares of American Airlines parent

AMR

(AMR)

were off 21 cents, or 2.4%, at $8.69;

Continental

(CAL) - Get Report

fell 22 cents, or 2.1%, to $10.43;

Delta

(DAL) - Get Report

lost 22 cents, or 3.3%, to $6.38;

Southwest

(LUV) - Get Report

was down 14 cents, or 0.9%, to $15.20; and

Northwest

(NWAC)

was down 31 cents, or 3.2%, to $9.39.

Airline stocks are sensitive to crude oil prices, which hit a closing record high of $55.17 late last month. Jet fuel is the second-largest cost for airlines behind labor expenses, and surging fuel costs caused third-quarter losses at most carriers. For example, American Airlines reported a third-quarter loss of $214 million and said fuel prices were $342 million higher in the quarter than a year earlier.

Earlier in Monday's session, the January crude oil futures contract climbed above $49 a barrel to hit its highest price in more than two weeks. Later, though, the contract price eased, recently falling 20 cents to $48.69. On Friday, traders bid up prices 5% on growing concerns about heating oil supplies ahead of winter.