Thirty-eight planes taking off or landing at Jackson Hole Airport in the last 14 years struck birds, four times causing substantial damage, the FAA reported Friday.

The figures from 1994 to 2008 work out to an average of 2.7 reported bird strikes a year, according to calculations based on the FAA data. In addition to four strikes resulting in substantial damage, three others caused moderate damage, the federal agency reported.

The national figures were posted on an FAA Web site because of pressure on the agency following the landing Jan. 15 of a US Airways jet in the Hudson River in New York due to bird strikes, The Associated Press reported.

The FAA had refused to release the information, catalogued by airport, until Transportation Secretary Ray LaHood instructed the agency otherwise.

The agency had said the public might draw unsubstantiated conclusions from the information. The Associated Press, which filed a request for the records under the Freedom of Information Act, said the FAA believes only 20 percent of wildlife strikes are reported under its system, which is voluntary.

Records for Jackson Hole show that most of the bird strikes were against unknown species. The largest number of strikes against birds that could be identified involved grouse.

Four strikes were listed against greater sage grouse, one against an unspecified grouse and one against a sharp-tailed grouse.

Jackson Hole Airport, in Grand Teton National Park, is a known lek, or breeding ground, for sage grouse. They strut on the runway annually in the spring, males courting mates before they disperse to raise young.

There is worry grouse are in decline in the West because of agriculture and oil and gas exploration. Some conservationists have called for their protection under the Endangered Species Act.

Across the U.S. and Canada, only five strikes against greater sage grouse were reported.

The FAA also reported two strikes each against sparrows and mountain chickadees, and one each against a kestrel, hawk, swallow and a wild turkey.

Of the four Jackson Hole strikes that caused substantial damage, which adversely affects an aircraft’s structural integrity, performance or flight characteristics, three were on commercial aircraft and one was on a business jet. Cost of damage to a Continental Airlines Boeing 737 amounted to $225,000 after a grouse was sucked into an engine in 2003, according to FAA reports. The business jet sustained $30,000 in damage after hitting a sage grouse.

The Continental jet’s takeoff was aborted while the aircraft was on its takeoff run, the report said. The report did not say what speed the jet was going when it ingested the bird.

The business jet made a “precautionary landing” after its incident, according to the FAA.

Of all the potential incidents that pilots fret about at Jackson Hole, an aborted takeoff is perhaps the most worrisome because of the runway’s length, 6,300 feet, and its elevation, about 6,400 feet.

In the other two incidents involving substantial damage, Delta Boeing 737s were on their landing roll when they ingested a bird or birds into an engine. In neither case was the species determined nor a cost of damage reported.