Omega Tau, a science & engineering podcast, with a light focus on aviation. For each episode, they invite a technical expert (e.g. they've had astronauts, various types of pilots, scientists/engineers, etc. on) and go in depth for 1-3 hours. They let their guests speak and they don't dumb it down too much, as they assume that most of their audience has some type of science/engineering background. No music / other filler content. It's from a German team but half the episodes are in English (and many of their guests are native English speakers). https://omegataupodcast.net/category/podcast-en/
Fighter Pilot Podcast. Exactly what it says. A former US Navy F/A-18 pilot invites other military aviation people to talk about military aviation related topics - "the aircraft, the weapons systems and the people" - an hour at a time. Somewhat technical at times, but generally focuses more on the people and the culture. It does get a bit repetitive after a hundred episodes or so (when they do one aircraft per episode), but the early episodes were great. https://www.fighterpilotpodcast.com/
Fighter Pilot Podcast. Exactly what it says. A former US Navy F/A-18 pilot invites other military aviation people to talk about military aviation related topics - "the aircraft, the weapons systems and the people" - an hour at a time. Somewhat technical at times, but generally focuses more on the people and the culture. It does get a bit repetitive after a hundred episodes or so (when they do one aircraft per episode), but the early episodes were great. https://www.fighterpilotpodcast.com/