The Associated Press___ Overhead bins get bigger MINNEAPOLIS (AP) â¿¿ Fliers can stop sharpening their elbows. Overhead bins are getting bigger. Packed planes and a high volume of carry-ons are forcing airlines to expand the space above passenger's heads. United and Delta are the latest airlines to replace or upgrade bins so they hold more luggage. And engineers at Boeing are designing jet interiors with today's bulkier luggage in mind. It's a chance to placate passengers who feel like they're thrown into a roller derby every time they board a plane. Because of fees on checked bags, more passengers are bringing carry-ons, which are growing in size. And with planes more crowded than ever, bins fill up before everyone has reached their seat. Travelers fight physics and one another to shove one more bag overhead. Or they're forced to check luggage at the gate. ___ EPA heightens scrutiny over Pennsylvania gas drilling DIMOCK, Pa. (AP) â¿¿ Tugging on rubber gloves, a laboratory worker kneels before a gushing spigot behind Kim Grosso's house and positions an empty bottle under the clear, cold stream. The process is repeated dozens of times as bottles are filled, marked and packed into coolers. After extensive testing, Grosso and dozens of her neighbors will know this week what may be lurking in their well water as federal regulators investigate claims of contamination in the midst of one of the nation's most productive natural gas fields. More than three years into the gas-drilling boom that's produced thousands of new wells, the U.S. Environmental Protection Agency and the state of Pennsylvania are tussling over regulation of the Marcellus Shale, the vast underground rock formation that holds trillions of cubic feet of gas. ___ US service firms grow at fastest pace in a year WASHINGTON (AP) â¿¿ U.S. service companies expanded in February at the fastest pace in a year, helped by a rise in new orders and job growth.