The first class cabins on Alaska Air's 737s may be nothing to bark over, but it's in line with all the other domestic carriers' narrow-body first class cabins. Before purchasing miles with Icelandair, be sure to check with Alaska Air to make sure that an award flight booking is available for your desired trip. It should also be noted that Icelandair has a roundtrip requirement for award travel on Alaska Air, so 15k won't get you a 1-way segment in first.
|Alaska Air first class seats|
Transcontinental routes out of Seattle, Portland, and LAX may be difficult to find in terms of award availability. However, non-hub routes like San Jose or Oakland to Honolulu, Kahului (Maui), or Lihue (Kauai) show up with extensive award availability. Considering that a roundtrip first class flight from SJC to HNL costs ~$1,330, this is a superb deal.