diff --git a/.github/workflows/periphery.yml b/.github/workflows/periphery.yml
new file mode 100644
index 0000000..75491e5
--- /dev/null
+++ b/.github/workflows/periphery.yml
@@ -0,0 +1,20 @@
+name: Periphery
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  periphery:
+    name: Run Periphery
+    runs-on: macos-26
+    steps:
+      - uses: actions/checkout@v6
+      - uses: SwiftyLab/setup-swift@latest
+        with:
+          swift-version: "6.2"
+      - name: Install Periphery
+        run: brew install periphery
+      - name: Run Periphery
+        run: periphery scan
diff --git a/.periphery.yml b/.periphery.yml
new file mode 100644
index 0000000..85b884a
--- /dev/null
+++ b/.periphery.yml
@@ -0,0 +1 @@
+retain_public: true
diff --git a/Sources/SwiftCIFP/CIFP.swift b/Sources/SwiftCIFP/CIFP.swift
index a0b0aba..b9ae127 100644
--- a/Sources/SwiftCIFP/CIFP.swift
+++ b/Sources/SwiftCIFP/CIFP.swift
@@ -30,9 +30,6 @@ import Foundation
 /// use ``linked()`` to create a ``CIFPData`` actor.
 public struct CIFP: Sendable, Codable {
 
-  /// Estimated number of records for pre-allocation.
-  private static let estimatedRecordCount = 400_000
-
   /// The file header information.
   public let header: Header
 
diff --git a/Sources/SwiftCIFP/Parser/CIFPByteParser.swift b/Sources/SwiftCIFP/Parser/CIFPByteParser.swift
index 1d2c15a..0368b21 100644
--- a/Sources/SwiftCIFP/Parser/CIFPByteParser.swift
+++ b/Sources/SwiftCIFP/Parser/CIFPByteParser.swift
@@ -117,20 +117,6 @@ struct ApproachContinuationRecord: Sendable {
 
 /// Parser for CIFP fixed-width records.
 struct CIFPByteParser: Sendable {
-  /// Standard CIFP record length.
-  static let recordLength = 132
-
-  /// Common field positions (0-indexed).
-  private static let fields = (
-    recordType: 0..<1,
-    customerArea: 1..<4,
-    sectionCode: 4..<6,
-    airportIdent: 6..<10,
-    icaoRegion: 10..<12,
-    fileRecordNumber: 123..<128,
-    cycleDate: 128..<132
-  )
-
   /// Parse a single record line.
   static func parseRecord(
     _ bytes: ArraySlice<UInt8>,
diff --git a/Sources/SwiftCIFP/Types/BearingRange.swift b/Sources/SwiftCIFP/Types/BearingRange.swift
index dddf5d7..55c9f8c 100644
--- a/Sources/SwiftCIFP/Types/BearingRange.swift
+++ b/Sources/SwiftCIFP/Types/BearingRange.swift
@@ -141,18 +141,6 @@ extension BearingRange {
   public static var fullCircle: BearingRange {
     BearingRange(from: 0, to: 360)
   }
-
-  /// Creates a bearing range from a standard Range.
-  init(_ range: Range<Double>) {
-    self.init(from: range.lowerBound, to: range.upperBound)
-  }
-
-  /// Creates a bearing range from a ClosedRange.
-  ///
-  /// Note: The upper bound is treated as exclusive for consistency.
-  init(_ range: ClosedRange<Double>) {
-    self.init(from: range.lowerBound, to: range.upperBound)
-  }
 }
 
 // MARK: - Measurement Support
diff --git a/Sources/SwiftCIFP/Types/ByteInitializable.swift b/Sources/SwiftCIFP/Types/ByteInitializable.swift
index e101258..19bf24e 100644
--- a/Sources/SwiftCIFP/Types/ByteInitializable.swift
+++ b/Sources/SwiftCIFP/Types/ByteInitializable.swift
@@ -11,16 +11,3 @@ extension ByteInitializable {
     self.init(rawValue: Character(UnicodeScalar(byte)))
   }
 }
-
-/// Protocol for String-based enums that can be initialized from ASCII bytes.
-protocol StringByteInitializable: RawRepresentable where RawValue == String {
-  init?(bytes: some RandomAccessCollection<UInt8>)
-}
-
-extension StringByteInitializable {
-  /// Initialize from ASCII bytes.
-  init?(bytes: some RandomAccessCollection<UInt8>) {
-    guard let string = String(bytes: Array(bytes), encoding: .utf8) else { return nil }
-    self.init(rawValue: string.trimmingCharacters(in: .whitespaces))
-  }
-}
diff --git a/Sources/SwiftCIFP/Types/Common/RecordType.swift b/Sources/SwiftCIFP/Types/Common/RecordType.swift
index f083d90..b41e599 100644
--- a/Sources/SwiftCIFP/Types/Common/RecordType.swift
+++ b/Sources/SwiftCIFP/Types/Common/RecordType.swift
@@ -11,29 +11,3 @@ enum RecordType: Character, Sendable, Codable, CaseIterable, ByteInitializable {
   /// Tailored record.
   case tailored = "T"
 }
-
-/// Customer/area code (positions 2-4).
-enum CustomerAreaCode: String, Sendable, Codable, CaseIterable {
-  /// United States.
-  case usa = "USA"
-
-  /// Canada.
-  case canada = "CAN"
-
-  /// Pacific.
-  case pacific = "PAC"
-
-  /// Continuation record (blank).
-  case continuation = "   "
-
-  /// Initialize from bytes, handling the "S   " pattern for continuation records.
-  init?<T: RandomAccessCollection>(bytes: T) where T.Element == UInt8, T.Index == Int {
-    let str = bytes.toString()
-    if str.isEmpty {
-      self = .continuation
-    } else {
-      guard let code = Self(rawValue: str) else { return nil }
-      self = code
-    }
-  }
-}