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Nuna AACE

The Nuna AACE is 22.5 in wide, weighs 15.6 lb, and has a booster weight limit of 120 lb, per Nuna. A high-back booster that converts to no-back, with an 8-position recline and 9-position headrest.

  • $300List price
  • 120 lbBooster to
  • 15.6 lbSeat weight
  • 22.5 inWidth
See it on Nuna's site

When does it expire?

Follow Nuna

All booster seats

AACE: key facts

  • The Nuna AACE works as a booster from 40 to 120 lb and 43 to 60 in tall, per Nuna.
  • Outgrown by height: "No Back mode: The top of the child's ears should be AT or BELOW the top of the vehicle seat back or the vehicle's headrest."
  • It installs with LATCH (lower anchor connectors) or seat belt.
  • Nuna says it expires 10 years after the date of manufacture.
  • Nuna says it isn't certified for aircraft.
  • It's 22.5 in wide at the widest point and weighs 15.6 lb.

From Nuna's manual and published specs. Always follow the limits on your seat's labels.

How the AACE stacks up

Against the 65 booster seats we track. The shaded band is where the middle half of them fall; the dot is this one.

Booster weight limit120 lbHighest booster limit of 64 booster seats

Within the typical range for booster seats (100 lb to 120 lb).

This one
100 lbmiddle 110 lb120 lb
Expiration10 years

Within the typical range for booster seats (8 years to 10 years).

This one
6 yearsmiddle 10 years12 years
Width22.5 in30th narrowest of 31

Above the typical range for booster seats (17 in to 18.6 in).

This one
10.2 inmiddle 17.3 in23.2 in
Weight15.6 lb34th lightest of 42

Above the typical range for booster seats (6 lb to 13.2 lb).

This one
1.8 lbmiddle 9.8 lb20.9 lb
Price$30051st lowest price of 53

Above the typical range for booster seats ($55.99 to $159.99).

This one
$19.98middle $79.99$399.99

What sets the AACE apart

Measured against the 65 booster seats we compare, from each maker's published specs.

  • Width: 22.5 inabove the middle half of the 31 booster seats that publish it (17 in to 18.6 in)
  • Weight: 15.6 lbabove the middle half of the 42 booster seats that publish it (6 lb to 13.2 lb)

Next to its closest matches

Flying with the AACE

Nuna's label: “This restraint is not certified for aircraft use.” American lists “Booster seats with no approval label or shoulder harness” under seats and devices not approved for use on board (source).

What airlines say about car seats:

  • American: “Each ticketed customer is allowed 1 stroller and 1 car seat to be checked free of charge” “If an unoccupied, adjoining seat is not available, the gate agent will check the safety seat to your final destination.” Source
  • Alaska: “We will transport your child's car seat and stroller free of charge as checked baggage.” Source
  • JetBlue: “Checking a child safety seat will not count towards your checked baggage allowance and there is no fee assessed” Source
  • Spirit: “One (1) car seat will be accepted per child as checked baggage at no charge.” Source
  • Frontier: “strollers and car seats can be checked for free.” Source
  • Allegiant: “There is no charge for checking or gate checking one car seat per fare-paying passenger.” Source
  • Breeze: “Child seats may be carried on board the aircraft if a seat has been purchased for the Infant or Child” Source

Quoted from each airline's page as of 2026-11-02.

Listed features

  • Grows with the child (headrest height, shoulder width, seat depth)
  • Recline in high-back mode
  • Fire-retardant-free materials
  • Dishwasher-safe cup holder

Worth checking

  • Wide, up to 22.5 in
  • 15.6 lb

Where to buy the AACE

Prices and availability change. We may earn a commission from some links.

good to know
  • Check for recalls: Search the agency's recall list with the model number and date code from the label: NHTSA recall search.
  • Car seat use and installation: see NHTSA's car seat page, which also lists free car seat inspection by certified technicians. Check the label and the maker's instructions, and ask your pediatrician about your child.

Full specs

Nuna AACE
TypeBooster
List price$300
Booster weight40–120 lb
Booster height43–60 in
Seat weight15.6 lb
Width22.5 in
Head ruleNo Back mode: The top of the child's ears should be AT or BELOW the top of the vehicle seat back or the vehicle's headrest.
InstallationLATCH (lower anchor connectors), seat belt
Load legNo
Anti-rebound barNo
RotatesNo
Recline positions8
Aircraft labelNot certified for aircraft
No added flame retardantsYes
Expires after10 years

Compare the AACE with

How each closest rival differs from the AACE, from the makers' specs.

Ask the meadow

AACE: questions answered

From Nuna's published specs, last checked 2026-11-06.

Will the Nuna AACE fit three across or in a small car?

It's wider than 97% of the boosters we track, at 22.5 in. The narrowest is the Mifold Comfort Grab-and-Go Booster at 10.2 in. Fit depends on your vehicle; check each seat's manual and your vehicle manual. Car seat use and installation: see NHTSA's car seat page, which also lists free car seat inspection by certified technicians. Check the label and the maker's instructions, and ask your pediatrician about your child.

Can you bring the Nuna AACE on a plane?

Nuna doesn't list it as certified for aircraft, so it can be checked as luggage but not used in the plane seat. See seats approved for planes.

AACE or Viaggio Flex 120: what's different?

By the makers' specs, the AACE has no added flame retardants (maker's claim); the Viaggio Flex 120 lists for $0.01 less. See every spec side by side.

Is it OK to buy a used AACE?

NHTSA publishes guidance on used car seats on its car seat page. Nuna lists a lifespan of 10 years from manufacture for this model. Check the label and the maker's instructions, and ask your pediatrician about your child.

Still wondering? Write to us at hello@cribpicks.com and we'll look it up.

More booster seats

Where these specs come from

Last checked 2026-11-06. Spot something wrong? Tell us. Read our editorial and safety policy and corrections.