
Cosco Kids
Scenera Next DLX Convertible Car Seat
Super light, cheap, great for air travel, but outgrown fast.

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Everyone has covered the key parts of your questions so I will just add: Definitely get a travel car seat. They are much lighter and a little narrower but still safe and compliant. We had one from Evenflo called a Sport or something but if you search on Amazon for a travel car seat options will come up. Extremely easy to install.
Look at Evenflo Maestro for travel
Evenflo Maestro is lightweight and fits those stats. I am a Child Passenger Safety Technician (CPST) and recommend it often for travel.
Put kiddo in a lightweight forward facing car seat instead, fits better and feels more like the car so kids behave better. Then use at destination. Cosco finale or Evenflo maestro is super light.
My skinny kids get bruised from some seats. Ive also had a cheap seat that was so difficult to tighten i threw it out. If i couldnt guarntee i could fasten the kids safely, it wasnt a safe seat. I will never touch the Evoflo brand again.
End of reviews

Cosco Kids
Scenera Next DLX Convertible Car Seat
Super light, cheap, great for air travel, but outgrown fast.

Cosco Kids
Scenera Next Convertible Car Seat
Portable, affordable, quickly outgrown, airplane buckle discomfort.

Joie
Mint Latch
Easy baseless LATCH install, lightweight, but quickly outgrown.

Nuna
PIPA Series
High-end travel, easy baseless install, but very pricey.

WAYB
Pico™ Portable Car Seat
Ultra-light, compact travel, quick install, but expensive and outgrown fast.

Ranked #1
Cosco Kids - Scenera Next DLX Convertible Car Seat

Ranked #1
Cosco Kids - Scenera Next Convertible Car Seat

Ranked #1
Cosco Kids - Scenera Next DLX Convertible Car Seat

Ranked #1
Doona - Doona Series

Ranked #1
Cosco Kids - Scenera Next Convertible Car Seat

Ranked #1
Nuna - PIPA Series