Probably, but I only know about airplane speeds (as opposed to cell phone speeds) because of my former job. I know that even today, planes on landing approach (max speed 250 knots in class B airspace, but typically below 200, down to mid 100s for actual landing) still make it hard to keep a signal. At full flight speed, it would be impossible, but at landing speeds, it becomes possible. I think the cell phone connection speed maximum is around 150-200 knots so it's totally possible when approaching landing, but definitely not going to happen at full speed. Or at crash speeds, like on 9/11.