Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
|  | Position | Age | Air Group or Subsidiary Officer Since |
| --- | --- | --- | --- |
| Bradley D. Tilden | Chairman and Chief Executive Officer of Alaska Air Group, Inc., Chairman of Alaska Airlines, Inc. and Virgin America Inc., Chairman of Horizon Air Industries, Inc. | 57 | 1994 |
| Benito Minicucci | President and Chief Operating Officer of Alaska Airlines, Inc. and Chief Executive Officer of Virgin America Inc. | 51 | 2004 |
| Brandon S. Pedersen | Executive Vice President/Finance and Chief Financial Officer of Alaska Air Group, Inc. and Alaska Airlines, Inc., and Chief Financial Officer of Virgin America Inc. | 51 | 2003 |
| Andrew R. Harrison | Executive Vice President and Chief Commercial Officer of Alaska Airlines, Inc. | 47 | 2008 |
| Kyle B. Levine | Vice President Legal, General Counsel and Corporate Secretary of Alaska Air Group, Inc. and Alaska Airlines, Inc. and Chief Ethics and Compliance Officer of Alaska Air Group, Inc. | 46 | 2016 |
| David L. Campbell | Former President and Chief Executive Officer of Horizon Air Industries, Inc. | 56 | 2014 |
| Gary L. Beck | President and Chief Executive Officer of Horizon Air Industries, Inc. | 70 | 2018 |
| Peter D. Hunt | President and Chief Operating Officer of Virgin America Inc. | 48 | 2017 |
| Shane R. Tackett | Senior Vice President, Revenue and E-commerce of Alaska Airlines, Inc. | 39 | 2017 |
| Andrea L. Schneider | Vice President People of Alaska Airlines, Inc. | 52 | 2017 |
| Diana Birkett Rakow | Vice President External Relations of Alaska Airlines, Inc. | 40 | 2017 |
Question:
Who was Alaska's CEO in 2017?
Answer:
Bradley D. Tilden