The benchmark on the summit of Langley is here. Not sure I can spot a date on it. Does it have special significance?
Sorry, I missed this post and didnt' reply earlier...
If I read it correctly, I see "14042" on there, which would be the surveyed elevation in feet. Unless a more recent survey has been done, this answers the question!
Those dual elevation data are annoying. I'm going with the USGS website, under the assumption that it reflects the most recent survey. The GNIS displays an elevation of 14026, I assume that the marker must reflect older data...
The most recent USGS topographical map quotes an elevation of 4275 meters, or when multiplied by 3.281, 14026 feet.
Did you note the date of the benchmark on the summit?
Another option for approaching Mount Langley is via Tuttle Creek. From the Stone House, continue up-canyon (the low path seems to be the easier ascent route) past the Keyhole Wall and up another mile until you reach the pseudo-basin at the Northeastern foot of Mount Langley. Running water and level white sand "beaches" can be found with a great view of the NE side of the peak.
A number of 2nd and 3rd class routes can be attempted from this side
I should also mention that there are certainly much more difficult AIx, 4th & 5th class routes as well; your imagination is the only limit here
The quota in the Inyo National Forest is actually from May 1st through November 1st and permits can be obtained from any one of the four Ranger Stations on the Forest: Mono Lake in Lee Vining, Mammoth Lakes Visitor Center in Mammoth, White Mountain Ranger Station in Bishop and yes, the Lone Pine Ranger Station in Lone Pine.