Atpl - Notes

They occur where the horizontal temperature gradient is strongest (baroclinic zone). The polar front jet sits beneath the polar tropopause break. The subtropical jet is driven by angular momentum conservation from the Hadley cell.

It sounds like you're looking for — likely beyond basic flashcards or summaries, and more into the why behind the rules, systems, and aerodynamics. atpl notes

During sterile cockpit, can the crew discuss a technical problem? Yes — if it's directly related to the flight (e.g., "Flaps 1 didn't come up"). No — if it's "What hotel are we staying at?" or "Did you see the game?" They occur where the horizontal temperature gradient is