By Laura Zuckerman SALMON, Idaho (Reuters) – A pilot crash-landed a small airplane on an Idaho freeway during the morning rush hour on Tuesday after he ran out of gas and forgot to switch to a back-up fuel tank, authorities said. The pilot, Jon Brinkerhoff, made the emergency landing of a 1970 single-engine Cessna just after 7 a.m. in the eastbound lanes of Interstate 84 near the Boise Airport, as motorists dialed 911, said Kelsie Massolio, dispatcher with Idaho State Police.