gsGroundScholar

Vanity N-number availability checker

N421XE is not registered in our FAA snapshot dated 2026-07-12 — likely available, subject to FAA reservation rules and a live FAA confirmation. Below are deterministically ranked alternatives by edit distance, keyboard proximity, phonetic match, and digit-letter pattern.

Result

N421XE

Likely available. N421XE is not in our FAA snapshot dated 2026-07-12.

Confirm with the FAA before applying: registry.faa.gov inquiry. FAA reservation costs $10 and lasts up to one year.

Close alternatives

Ranked by edit distance, keyboard proximity, phonetic match, and digit-letter pattern. Higher score is closer.

  • N421X

    score 1.03 · edit 1 · keyboard 0

    likely available
  • N321XE

    score 1.01 · edit 1 · keyboard 1

    likely available
  • N521XE

    score 1.01 · edit 1 · keyboard 1

    likely available
  • N411XE

    score 1.01 · edit 1 · keyboard 1

    likely available
  • N431XE

    score 1.01 · edit 1 · keyboard 1

    likely available
  • N422XE

    score 1.01 · edit 1 · keyboard 1

    likely available
  • N421XD

    score 1.01 · edit 1 · keyboard 1

    likely available
  • N421XR

    score 1.01 · edit 1 · keyboard 1

    likely available
  • N421XW

    score 1.01 · edit 1 · keyboard 1

    likely available
  • N221XE

    score 1.00 · edit 1 · keyboard 2

    likely available
  • N621XE

    score 1.00 · edit 1 · keyboard 2

    likely available
  • N441XE

    score 1.00 · edit 1 · keyboard 2

    likely available

FAQ

How does N-number availability work?
The FAA reserves N-numbers on request for $10. The pool is a finite alphanumeric set governed by 14 CFR §47.15. GroundScholar Registry checks the FAA registry plus our snapshot to estimate availability.
Why are some letters never used?
The letters I and O are excluded across the FAA tail format because they look like the digits 1 and 0. The first character after N also cannot be 0.
How are alternatives ranked?
A deterministic score combines edit distance, QWERTY keyboard proximity, phonetic equivalence, and digit-vs-letter character class. No language model is involved.
Will GroundScholar reserve the tail for me?
Concierge reservation is on the way. Join the waitlist below; you'll be notified when the service ships.

Sources