Marble Institute of Technology

Journal

Follow the Phone

Aviation is running telecom's playbook. The year is 1985.

Happy Friday Jr!

More notes on where the Aerial Economy is headed.

My favorite guide is the telecom industry. 

It just fits.

It took 107 years to get from Bell's telephone patent to the first commercial cell call.

For most of that century, the phone was bolted to a wall. 

It rang a place, not a person.

A red British telephone box in London, with Big Ben's clock tower behind it at dusk.

Then came the cell phone.

A film still of a man in a dark robe on a beach at dawn, talking on a large 1980s brick mobile phone.

Aviation is on the same path. It's leaving the wall.

This week, Zipline entered talks to raise about $1 billion at a valuation near $20 billion.

That's nearly 3x its January mark.

Bloomberg headline: Drone Startup Zipline in Talks on About $1 Billion Raise at $20 Billion Valuation.

A month ago, it partnered with Uber. The target is one million drone deliveries a day by the end of 2029.

A white Zipline delivery drone hovering over a green Uber Eats bag on the porch of a house.

What's happening in transportation and logistics is the most exciting story in the world.

Forget the AI. Forget the politics. Forget the wars and the endless grift. Forget football.

We are living at the dawn of a new era in transportation.

It's the closest thing to teleportation we've ever seen.

The Same Stack

Every network gets built the same way. Rules at the bottom. Customers on top.

Chart titled Same Stack. One Empty Seat. It compares telecom and aviation layer by layer, from rules up to apps. Telecom's sites layer is filled by American Tower, Crown Castle and SBA; in aviation, vertiports have Skyports but the drone sites seat is still open.

Aviation already has a name in almost every row. Devices. Carriers. Chargers. Traffic control.

One row is still open. The site.

In telecom, that row became American Tower.

A cell tower covered in antennas, with the Pittsburgh skyline and a river behind it.

The S-Curve

Cell phones didn't take off. They crawled.

In 1985, there were 340,213 wireless subscribers. Ten years later, 33.8 million, ~13% of the country.

Then the curve went vertical. By 2010, there were 96 phones for every 100 Americans.

For reference, the iPhone dropped in 2007. Cell phones matured to the “early majority” stage before Steve + co took over.

Line chart titled The S-Curve: U.S. wireless subscriptions per 100 people, from under 1 in 1985 to 13 in 1995, 39 in 2000, 70 in 2005 and 96 in 2010, passing one phone per person after 2012.

And behind every point on that line is steel. 913 cell sites in 1985. 447,605 in 2024.

Area chart titled Steel in the Ground: U.S. cell sites in service grew 490 times in 39 years, from 913 in 1985 to 447,605 in 2024.

Subscribers to Deliveries

Telecom tracks subscribers. Aviation // logistics logs deliveries.

In April 2024, Zipline made a delivery every 70 seconds. Today, every 20.

The 2029 target works out to about 11 per second.

Bar chart titled The Curve Hasn't Started: Zipline drone deliveries per day, about 1,200 in April 2024 and 4,300 in August 2026, against a target of 1,000,000 in 2029.

Those two short bars are akin to telecom in 1985. It’s so early.

And my FAA registry data says the same thing. Delivery drones on the FAA registry grew 69% in five months. 

Build the Tower

Zipline is Ma Bell. It builds the aircraft, the docks, and the routes, because nothing exists to plug into yet.

Networks don't stay that way. Carriers sold their towers. Tower companies bought them. The tenancy layer won.

In case you missed it - Zipline founder Keller Rinaudo Cliffton sat down with the Relentless podcast to talk about the company’s growth. 

It’s a must-listen. 

Here’s the money quote,

Technologies have to be scaling in a way that makes neighborhoods more beautiful, quieter, safer, with less pollution and less traffic.

So, where's my flying car? It's coming.

Godspeed.

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