A flight last week, called the Arctic Domain Awareness, also provided training for the crew of the C-130 cargo plane and permitted time for law enforcement patrol, officials said.
Rear Adm. Gene Brooks, commander of the 17th Coast Guard District, said the Coast Guard needs to know about the lay of the land and what other countries might be in the Arctic.
"Climate change is upon us," Brooks said. "The Arctic sea ice is leaving earlier and coming later."
During one of the flights, which began last year, Brooks said, the Coast Guard was surprised to come upon Chinese research vessels.
Brooks said the Coast Guard plans a two-week experiment later in the summer to move heavy equipment and other resources to Barrow and determine whether operations there are feasible.
"We, as a nation, must understand the challenges, opportunities and changes this environment might present," Brooks said.
Pilot Lt. Steve McKechnie said last week's flight introduced some possible communications glitches. For a while, the crew had difficulty contacting the Kodiak base, which they must check in with every half hour.
The plane had to retrace its route until contact could be established.
"Other than that, I thought it went really well," McKechnie said.
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