Searchers failed again Wednesday to find any trace of a light plane missing on a flight from Grand Junction, Colo., to Thermal, Calif., a Civil Air Patrol spokeswoman said.

Searchers concentrated on California, Colorado and Utah Tuesday when bad weather prevented the Arizona CAP from launching its planes. The Colorado and Utah units were on standby Wednesday.Joyce Kienitz, a spokeswoman for the Arizona CAP, said 18 planes were involved in the search in Arizona, and additional personnel continued to look for the missing Beech Bonanza in California.

In Arizona, searchers concentrated on the Hualapai Mountains in the northwestern corner of the state, Kienitz said. She said the search would resume at first light Thursday.

"We will continue to search until any and all leads have been exhausted . . . we don't give up easily," she said.

The single-engine plane was flown by William Crimmins, 57, a Thousand Oaks, Calif., hotel chain executive, according to a California Civil Air Patrol spokesman, Ed Crankshaw. Crimmins was to stop at Thermal, Calif., to drop off a passenger, Lavonne Deschepper, and then fly to Phoenix to spend Thanksgiving.

CAP spokesmen said the plane took off at 7:40 p.m. Monday from Grand Junction and was due to arrive in Thermal at 6 a.m. Tuesday.

Kienitz said radar recordings indicated the plane had flown at least as far as the Kingman area, in northwestern Arizona.