June 15 is a significant day in Alaska's history, marking several milestones and events that the state has experienced. Here are 5 interesting facts about June 15 in Alaska history:

1. In 1967, Alaska Governor Walter J. Hickel signed the agreement to construct the Trans-Alaska Pipeline System (TAPS), a 48-inch diameter pipeline that would transport crude oil over 800 miles from Prudhoe Bay on the Arctic Ocean to the port of Valdez on the Gulf of Alaska. The pipeline, completed in 1977, became a vital component of the state's economy and played a crucial role in Alaska's oil production to this day.

2. In 1978, Alaska Airlines became the first airline in the US to use a computer-based flight dispatch system, which allowed pilots to receive up-to-date weather and flight information. The dispatch system, developed by Honeywell, was hailed as a major advancement in aviation technology and helped Alaska Airlines operate more efficiently and safely.

3. June 15, 1999, marked the launch of the Russian-American Long-Term Census of the Arctic, a joint venture between the United States and Russia to study the Arctic ecosystem and its inhabitants. The initiative aimed to gather data on the Arctic's changing climate, wildlife populations, and physical oceanography to better understand the region's ecological dynamics.

4. In 2006, researchers announced the discovery of the oldest human remains ever found in Alaska, estimated to be between 9,000 and 11,000 years old. The remains, found at the Upward Sun River site in the Tanana River Valley, provided new insights into the history of human habitation and migration in the region.

5. June 15, 2018, marked the 40th anniversary of the eruption of Mount St. Helens, a volcano located in southwest Washington State. Though the eruption occurred outside of Alaska, its aftermath had a significant impact on Alaska's economy and aviation industry. The eruption released a massive ash cloud that disrupted air travel across the northern hemisphere and caused a temporary shutdown of Alaska's largest airport in Anchorage.

Overall, June 15 represents an important day in Alaska's history, highlighting the state's significant contributions to technology, environmental research, and the study of human history.