Qatar Airways has one of the strangest, and most useful, cabin-labeling quirks in aviation.
On many short flights around the Middle East, Qatar sells the forward cabin as First Class even when the seat itself is the same hardware it would call Business Class on another route. Muscat and Cairo are good examples, and on some routes even the specific flight matters.
That label matters much more on the ground than it does in the air.
If you are flying Qatar Airways Business Class into Doha and your onward regional segment is ticketed as First Class, that First Class boarding pass gets you into Al Safwa First Lounge during the connection. You do not need to buy one of Qatar's rare long-haul First Class tickets.
On many cash through-itineraries booked in Business Class, that short regional sector can also book into First Class automatically when the route is sold that way and space is available. So the overall trip can effectively be a Business Class fare, while the last little hop carries a First Class cabin designation and unlocks the better lounge.
And Al Safwa is worth knowing about. It is less airport lounge than enormous modern museum: soaring stone, quiet rooms, proper a la carte dining, showers, spa facilities and private sleeping rooms for longer connections. It is a very different way to spend a Doha layover.
The important part is to look at the actual cabin on the actual flight. Qatar does not market every regional premium cabin as First Class, and different frequencies to the same city can be sold differently. Award pricing is also less predictable, particularly when redeeming Qatar's own Avios, so this is not literally free on every booking.
But when the routing lines up, the trick is simple: fly the long haul in Business Class, make the last hop one of Qatar's regional First Class sectors, and walk through the First Class door in Doha.
This is exactly the kind of detail I look for when building a routing. The flight is only one part of the ticket.
If you want me to build the whole thing around the way you actually travel, let me know.