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> But even those get reused from week to week (even day to day?)

It's quite normal, especially in the US

> United 1644 operates BDL-IAD-IAH-MCO, yet BDL-IAD operates as a 737-800, IAD-IAH operates as a 757-200, and IAH-MCO flies with a 757-300.

Looks like that specific flight number is no longer a multi segment.

Yes, that is what I meant. For example, EK202 is unique to Emirates. Even if they change the airplane, the flight number remains constant.

EK202 is just short hand for Emirates flight 202. EK is the IATA code for the airline, and 202 is the flight number.

When I was developing this I noticed Southwest uses the same Flight # for a many different routes.