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Britax Skyline 2-Stage Belt-Positioning Booster

The Britax Skyline 2-Stage Belt-Positioning Booster has a booster weight limit of 120 lb and has an expiration of 10 years, per Britax.

  • $139.99List price
  • 120 lbBooster to
See it on Britax's site

When does it expire?

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Skyline 2-Stage Belt-Positioning Booster: key facts

  • The Britax Skyline 2-Stage Belt-Positioning Booster works as a booster from 40 to 120 lb and 44 to 63 in tall, per Britax.
  • Outgrown by height: "High-back: "the top of the head restraint is above the child’s ears". Backless: "The top of the child’s ears must be below the top of the vehicle head restraint.""
  • It installs with vehicle lap-shoulder belt or lower connectors (LATCH) + vehicle lap-shoulder belt.
  • Britax says it expires 10 years after the date of manufacture.
  • Britax says it isn't certified for aircraft.

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

How the Skyline 2-Stage Belt-Positioning Booster 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
Price$139.9937th lowest price of 53

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

This one
$19.98middle $79.99$399.99

What sets the Skyline 2-Stage Belt-Positioning Booster apart

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

Next to its closest matches

  • Peg Perego Viaggio Shuttle 120Next to it, the Skyline 2-Stage Belt-Positioning Booster is 2 years shorter before it expires; $10 more.
  • Diono Everett NXTNext to it, the Skyline 2-Stage Belt-Positioning Booster is 2 years longer before it expires; $10 more.
  • Clek OlliNext to it, the Skyline 2-Stage Belt-Positioning Booster is 1 years longer before it expires; $10 less.

Flying with the Skyline 2-Stage Belt-Positioning Booster

Britax's label: “This Restraint is Not Certified for Use in Aircraft, because Aircraft do not have shoulder belts.” 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.

Where to buy the Skyline 2-Stage Belt-Positioning Booster

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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

Britax Skyline 2-Stage Belt-Positioning Booster
TypeBooster
List price$139.99
Booster weight40–120 lb
Booster height44–63 in
Head ruleHigh-back: "the top of the head restraint is above the child’s ears". Backless: "The top of the child’s ears must be below the top of the vehicle head restraint."
Installationvehicle lap-shoulder belt, lower connectors (LATCH) + vehicle lap-shoulder belt
Load legNo
Anti-rebound barNo
RotatesNo
Aircraft labelNot certified for aircraft
Expires after10 years

Compare the Skyline 2-Stage Belt-Positioning Booster with

How each closest rival differs from the Skyline 2-Stage Belt-Positioning Booster, from the makers' specs.

Ask the meadow

Skyline 2-Stage Belt-Positioning Booster: questions answered

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

Can you bring the Britax Skyline 2-Stage Belt-Positioning Booster on a plane?

Britax 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.

Skyline 2-Stage Belt-Positioning Booster or Viaggio Shuttle 120: what's different?

By the makers' specs, the Viaggio Shuttle 120 has no added flame retardants (maker's claim); the Viaggio Shuttle 120 lists for $10 less. See every spec side by side.

Is it OK to buy a used Skyline 2-Stage Belt-Positioning Booster?

NHTSA publishes guidance on used car seats on its car seat page. Britax 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.

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Where these specs come from

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