President Obama is visiting Anchorage Thursday morning. The FAA restricts flights around ANC to protect him, in this instance they're restricting a 30nm radius around ANC.

Just to give you an idea of the aviation scene around Anchorage, this is the list of impacted airports identified by the FAA:

==> IMPACTED AIRPORTS <==

Alaska Regional Hospital Heliport 2OK
Merrill Field MRI
Lake Hood Strip Z41
Lake Hood SPB LHD
Ted Stevens Anchorage International ANC
Campbell Lake SPB SPB 3C3
Goose Bay Z40
D&C Fire Lake Flying Club SPB D72
Birchwood BCV
Brocker Lake SPB 6A7
Big Lake BGQ
Jones Landing SPB L95
Blodget Lake SPB D75
Beaver Lake SPB D71
Hope 5HO
Wasilla IYS
Lake Lucille SPB 4A3
Seymour Lake SPB SPB 3A3
Visnaw Lake SPB T66
Wasilla Lake SPB 5L6
Bold A13
Island Lake SPB 29A
Upper Wasilla Lake 3K9
Girdwood AQY
Finger Lake SPB 99Z
Nancy Lake SPB 78Z
Niklason Lake SPB 4AK0
Butte Municipal AK1
Palmer Municipal PAQ
Minuteman Lake SPB MFN