Elon Musk's Starlink is dominating in-flight WiFi. Here's which airlines have it — and how to check if your plane does.

Elon Musk's Starlink WiFi is gaining popularity among airlines. Thomas Barwick/Getty Images Over 40 global airlines have announced deals for Elon Musk's Starlink WiFi. The ultra-high-speed WiFi is free on airlines that offer it, but some require a loyalty account. Starlink is already available on some airlines — here's how to find out if your plane has it. From United Airlines and Emirates to British Airways and Air New Zealand, Elon Musk's Starlink is gaining popularity across global…