NEW YORK -- Stocks that traded heavily or had substantial price changes on Wednesday:

       American Airlines Group Inc., down 80 cents to $13.31.

       The airline warned that higher fuel costs will hurt its third-quarter earnings.

       Spirit Airlines Inc., down $1.08 to $16.20.

       The airline said that rising fuel prices are hurting profit margins.

       BP Plc., up 16 cents to $38.26.

       Bernard Looney resigned as CEO of the British oil giant.

       Cracker Barrel Old Country Store Inc., down $2.25 to $71.93.

       The restaurant chain's fiscal fourth-quarter revenue fell short of Wall Street forecasts.

       REV Group, Inc., up $1.11 to $13.99.

       The maker of ambulances, buses and other specialty vehicles reported strong fiscal third-quarter earnings and revenue.

       Hain Celestial Group Inc., up 65 cents to $10.43.

       The maker of Celestial Seasonings tea announced a restructuring plan.

       Moderna Inc., up $3.35 to $108.59.

       The biotechnology company gave investors an encouraging update on a potential flu vaccine.

       Rocket Pharmaceuticals Inc., up $5.94 to $21.23.

       U.S. regulators OK'd the drugmaker to proceed with a study on a potential genetic disorder treatment.