The Dow Jones Transportation Average slumped 0.5% in morning trading Wednesday, with 14 of its 20 components losing ground, the buck the gains seen in the broader stock market toward record highs. The biggest decliners within the transports tracker were shares of Avis Budget Group Inc. , which fell 2.5%; Ryder System Inc. , which lost 2.0% and Expeditors International of Washington Inc. , which declined 1.9%. The biggest gainer was American Airlines Group Inc.'s stock , which rose 1.7% after the air carrier raised its second-quarter unit revenue guidance, citing lower-than-expected seat supply. Meanwhile, the Dow transports' sister index, the Dow Jones Industrial Average rose 43 points, or 0.2%, with 19 of 30 components losing ground. While the Dow industrials had reached an all-time intraday high of 26,983.45 earlier in the session, the Dow transports' intraday high of 10,436.43 was 10.2% below the intraday record of 11,623.58 reached on Sept. 14, 2018.