| Added Frequency 155.94 (Airport Authority) | PJH | 2017-07-07 19:24:19 |
| Added Frequency 155.865 (Airport Authority) | PJH | 2017-07-07 19:23:47 |
| Added Subcategory: Airport Operations | PJH | 2017-07-07 19:21:52 |
| General text description updated | PJH | 2017-07-07 19:20:59 |
| Frequencies Updated (Updated: 0, Deleted 2) for Helena Regional Airport | PJH | 2017-07-07 19:20:22 |
| Frequencies Updated (Updated: 0, Deleted 1) for Helena Regional Airport | PJH | 2017-07-07 19:12:32 |
| Added Frequency 120.4 (ATIS) | PJH | 2017-07-07 19:12:17 |
| General text description updated | PJH | 2017-07-07 19:11:39 |
| Added Frequency 130.1 (Skywest) | PJH | 2017-07-07 19:10:11 |
| Added Subcategory: Airline Operations | PJH | 2017-07-07 19:09:41 |
| Added Frequency 40.56 (ARNG Operations) | PJH | 2017-07-07 19:08:53 |
| Added Frequency 321.45 (ARNG Operations) | PJH | 2017-07-07 19:08:32 |
| Added Frequency 126.2 (ARNG Operations) | PJH | 2017-07-07 19:07:20 |
| Frequencies Updated (Updated: 2, Deleted 0) for Helena Regional Airport | PJH | 2017-07-07 19:06:45 |
| Sort order changed to from 0 for subcat: Air Traffic Control | PJH | 2017-07-07 19:06:16 |
| Frequencies Updated (Updated: 1, Deleted 0) for Helena Regional Airport | PJH | 2017-07-07 19:06:12 |
| Added Frequency 257.8 (Tower 0600-2200) | PJH | 2017-07-07 19:05:58 |
| Added Frequency 229.4 (Approach 0600-2200) | PJH | 2017-07-07 19:05:32 |
| Added Frequency 119.5 (Approach 0600-2200) | PJH | 2017-07-07 19:05:10 |
| Added Frequency 121.9 (Ground) | PJH | 2017-07-07 19:04:35 |
| Added Frequency 122.95 (UNICOM) | PJH | 2017-07-07 19:04:20 |
| Added Frequency 118.3 (CTAF) | PJH | 2017-07-07 19:04:02 |
| Added Subcategory: Air Traffic Control | PJH | 2017-07-07 19:02:57 |
| Added category (Helena Regional Airport 99) | PJH | 2017-07-07 19:02:37 |
| Agency: Helena Regional Airport (HLN) changed from Helena Regional Airport (HLN) (Aircraft / Airport) to Helena Regional Airport | PJH | 2017-07-07 19:01:38 |
