If you think about it, rapidly reusable suborbital rockets are like a physical version of the communication you describe here. It's plausible to physically be a

If you think about it, rapidly reusable suborbital rockets are like a physical version of the communication you describe here. It's plausible to physically be anywhere in the world (if you burn enough fuel) within 30 minutes. Ditto up to 10 tonnes of cargo.