| 2023-01-19 | Unit associated with waves |
| 2021-12-25 | One cycle per second |
| 2019-01-18 | First person to broadcast radio waves |
| 2018-12-15 | Bandwidth unit |
| 2016-12-28 | Dollar alternative |
| 2016-04-19 | Alternative to Enterprise |
| 2015-07-10 | Frequency unit |
| 2015-03-02 | Avis rival |
| 2008-11-27 | Enterprise rival |
| 2008-11-13 | National alternative |
| 2007-06-11 | #1 to Avis's #2 |
| 2007-01-30 | Alamo competitor |
| 2006-08-07 | Avis rival |
| 2006-06-13 | Frequency unit |
| 2006-02-28 | Frequency unit |
| 2003-05-02 | Thrifty competitor |
| 2002-12-22 | One cycle per second |
| 2002-06-02 | Nobelist for whom a physics unit is named |
| 2002-01-14 | Avis rival |
| 2000-06-11 | Budget alternative |
| 1997-01-10 | Frequency unit |
| 1995-06-07 | Budget alternative |
| 1995-02-14 | Airport booth leaser |