# Activating the Aircraft {% hint style="warning" %} **An active internet connection is required on initial activation of the aircraft.** After this, the aircraft can be used offline for a period of time. Our system will automatically check your license sporadically. If you require assistance or have a setup that prevents this from functioning correctly, please contact us at {% endhint %} Miltech Simulations’ MH-60 uses a lightweight activation and version control system to ensure your product license is valid and always up to date. Depending on where you purchased the product, activation may differ: * **MiltechSimulations.com / Contrail App**\ A serial key is generated and automatically entered into the product. Under normal circumstances, activation happens silently and without user input. * **iniBuilds / BlackbirdSim.com**\ A serial key is provided at the time of purchase. You must copy and paste this key into the aircraft’s **PFD Popup activation panel** upon first simulator load. * **MS Marketplace**\ No activation key is required. The product activates automatically through the simulator platform. *** ### Common Activation Issues If the product fails to activate correctly, it may present in one or more of the following ways: * **Primary Flight Display (PFD) and Multi-Function Display (MFD) appear completely black** * **Error messages appear on one or both avionics screens upon loading the aircraft** * **Activation prompt fails to accept a valid key or does not respond** If you experience any of these issues, please contact our support team with your purchase information and a brief description of the problem. We're here to help.