| A110*G | This airport has been surveyed by the national geodetic survey. |
| A110-1 | No snow removal. |
| A110-2 | Airport available and staffed 1 june - 30 sept; contact FBO 406-646-7359 or owner 406-444-2506 for info other times. |
| A110-3 | Heavy snowmobile use on/adjacent runway winter mos. |
| A110-4 | Airport closed from dec 1 through may 31 except with prior permission required. Please call 406-444-2506. |
| A16 | If no answer please call 406-444-2506/640-1648 |
| A24 | Landing fee for aircraft over 11000 lbs. |
| A26 | Prior permission required for air carrier operations with more than 30 passenger seats please call airport manager 406-646-7631 or 406-646-9321. |
| A70 | For fuel during off season hours, please call 406-646-7359. |
| A81 | Activate HIRL runway 01/19 and MALSR runway 01 - CTAF; not available 01 OCT-31 may . |
