In 2026, the answer is "Yes, but it depends on the airline." We have finally reached a tipping point where many major carriers have upgraded to high-speed, low-latency satellite systems like Starlink or Viasat-3. For example, Delta Air Lines now offers free, streaming-quality Wi-Fi on nearly its entire fleet, allowing passengers to watch Netflix or YouTube in 1080p without buffering. British Airways and United have also rolled out Starlink-powered systems that support online gaming and video calls. However, on older aircraft or regional jets that still rely on "Air-to-Ground" (ATG) technology, the connection remains sluggish and is barely sufficient for checking emails, let alone streaming. Even with the best systems, bandwidth is shared among all passengers, so you may see a drop in quality if 200 people are all trying to stream 4K video simultaneously. To be safe, the "traveler's rule" in 2026 is still to download your favorite shows for offline viewing before you board, using the in-flight Wi-Fi only as a secondary option for browsing or live-scrolling social media.