Low-cost carriers Jetstar, AirAsia form alliance+   AP NewsAlert   Dollar weak in upper 91 yen in Tokyo, but falls limited ahead of jobs data+   Grim Obama says terror attack 'dots' not connected   Officials: 2 likely dead in Ill. small plane crash   2ND LD: U.S. eclipsed by China in 2009 auto sales+   US team may have found key to fight obesity: study   Hatoyama to decide on Fujii's fate based on doctor's assessment: Hirano+   Ill. suspends 2nd release program pending review   AP source: Shanahan agrees to coach Redskins   1,000 people homeless on Solomons after tsunami   Main events scheduled for Thursday, Jan. 7+   Key 10-year JGB yield rises in morning to new 1.5-month intraday high+   Chopper crashes in remote Calif. forest; 4 men die   LEAD: Tokyo stocks rise on gains in banks, yen relief in choppy trade+   AP sources: Colorado Gov. Ritter to retire   2ND LD: Hatoyama voices hope Fujii would stay on as finance minister+   Sea Shepherd obstructs Japan's whaling operations for 4th time+   Mike Shanahan agrees to become Washington Redskins coach.   AP sources: Colorado Democratic Gov. Bill Ritter won't seek re-election this fall.