Amazon CEO Andy JassyMichael M. Santiago/Getty ImagesAndy Jassy emphasized aggressive investment in AI during a call with analysts.Amazon plans $75 billion in capex, and even more in 2025, mostly for cloud services.Amazon's AI services are rapidly growing, with significant demand for AWS's AI chips.Just when you thought Big Tech executives couldn't get more bullish on AI, Amazon CEO Andy Jassy upped the ante on Thursday.During a call with analysts, he described a range of attractive opportunities for Amazon, and said the company will continue to "aggressively" invest in AI.Amazon is on pace to spend $75 billion on capital expenditures this year, and it will spend even more in 2025, the CEO added.