diff --git a/CHANGELOG.md b/CHANGELOG.md
index efc96ae..111d5ca 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,20 @@ All notable changes to this project are documented here.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.4.0] - 2026-06-26
+
+### Added
+
+- `And` aircraft filter combinator (logical AND) — the value form of the
+  implicit AND that `Filter`/`All` apply to their arguments. Pairs with `Or`/`Not`
+  for nesting, e.g. `Or(And(a, b), And(c, d))`.
+
+### Changed
+
+- Renamed the `Any` filter combinator to `Or`, giving a consistent
+  `And`/`Or`/`Not` vocabulary. **Breaking:** callers using `Any` must switch to
+  `Or`.
+
 ## [0.3.2] - 2026-06-26
 
 - `WithinNMOf` aircraft filter for distance from an arbitrary point.
@@ -56,7 +70,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   the `pkg/client` HTTP client with one-shot queries and channel/iterator
   polling for every endpoint, the `cmd/wingbits` CLI, and a README.
 
-[Unreleased]: https://gitea.libretechconsulting.com/rmcguire/wingbits/compare/v0.3.1...HEAD
+[Unreleased]: https://gitea.libretechconsulting.com/rmcguire/wingbits/compare/v0.4.0...HEAD
+[0.4.0]: https://gitea.libretechconsulting.com/rmcguire/wingbits/compare/v0.3.2...v0.4.0
+[0.3.2]: https://gitea.libretechconsulting.com/rmcguire/wingbits/compare/v0.3.1...v0.3.2
 [0.3.1]: https://gitea.libretechconsulting.com/rmcguire/wingbits/compare/v0.3.0...v0.3.1
 [0.3.0]: https://gitea.libretechconsulting.com/rmcguire/wingbits/compare/v0.2.1...v0.3.0
 [0.2.1]: https://gitea.libretechconsulting.com/rmcguire/wingbits/compare/v0.2.0...v0.2.1
diff --git a/README.md b/README.md
index 0dd86c8..9b8c201 100644
--- a/README.md
+++ b/README.md
@@ -140,9 +140,15 @@ local, _ := c.Aircraft(ctx,
 
 // OR-composition and negation:
 heavies, _ := c.Aircraft(ctx,
-    readsb.Any(readsb.WithCategory("A5"), readsb.WithType("mlat")),
+    readsb.Or(readsb.WithCategory("A5"), readsb.WithType("mlat")),
     readsb.Not(readsb.OnGround()),
 )
+
+// And is the value form of the implicit AND, for nesting inside Or:
+nearby, _ := c.Aircraft(ctx, readsb.Or(
+    readsb.And(readsb.WithCategory("A7"), readsb.WithinNMOf(40.7, -74.0, 5)),
+    readsb.And(readsb.WithCategory("A7"), readsb.WithinNMOf(41.9, -72.7, 5)),
+))
 ```
 
 | Filter Name | Description | Sample Usage |
@@ -165,7 +171,8 @@ heavies, _ := c.Aircraft(ctx,
 | `SeenWithin` | Keeps aircraft heard from within the given duration. | `readsb.SeenWithin(5*time.Minute)` |
 | `MinRSSI` | Keeps aircraft whose average signal strength is at or above dbfs (e.g. -24). | `readsb.MinRSSI(-24)` |
 | `Not` | Inverts a filter. | `readsb.Not(readsb.OnGround())` |
-| `Any` | Keeps aircraft matching at least one of the supplied filters (logical OR). | `readsb.Any(f1, f2)` |
+| `And` | Keeps aircraft matching every supplied filter (logical AND). | `readsb.And(f1, f2)` |
+| `Or` | Keeps aircraft matching at least one of the supplied filters (logical OR). | `readsb.Or(f1, f2)` |
 
 ### Streaming
 
diff --git a/pkg/types/readsb/filter.go b/pkg/types/readsb/filter.go
index 23d3d47..3ffec2c 100644
--- a/pkg/types/readsb/filter.go
+++ b/pkg/types/readsb/filter.go
@@ -174,13 +174,22 @@ func MinRSSI(dbfs float64) AircraftFilter {
 	return func(a *Aircraft) bool { return a.RSSI >= dbfs }
 }
 
+// And, Or, and Not compose filters as boolean operators. Filter/All already AND
+// their arguments; And is the value form, letting you nest, e.g.
+// Or(And(a, b), And(c, d)).
+
 // Not inverts a filter.
 func Not(f AircraftFilter) AircraftFilter {
 	return func(a *Aircraft) bool { return !f(a) }
 }
 
-// Any keeps aircraft matching at least one of the supplied filters (logical OR).
-func Any(filters ...AircraftFilter) AircraftFilter {
+// And keeps aircraft matching every supplied filter (logical AND).
+func And(filters ...AircraftFilter) AircraftFilter {
+	return func(a *Aircraft) bool { return keep(a, filters) }
+}
+
+// Or keeps aircraft matching at least one of the supplied filters (logical OR).
+func Or(filters ...AircraftFilter) AircraftFilter {
 	return func(a *Aircraft) bool {
 		for _, f := range filters {
 			if f(a) {
diff --git a/pkg/types/readsb/readsb_test.go b/pkg/types/readsb/readsb_test.go
index e06494f..c41d55c 100644
--- a/pkg/types/readsb/readsb_test.go
+++ b/pkg/types/readsb/readsb_test.go
@@ -113,21 +113,34 @@ func TestWithinNMOf(t *testing.T) {
 	}
 }
 
-func TestAnyOR(t *testing.T) {
-	// Two non-overlapping 5 nm circles; Any should keep aircraft in either.
+func TestOr(t *testing.T) {
+	// Two non-overlapping 5 nm circles; Or should keep aircraft in either.
 	r := &AircraftReport{Aircraft: []Aircraft{
 		{Hex: "nearA", Lat: 40.01, Lon: -75.0},
 		{Hex: "nearB", Lat: 41.0, Lon: -76.01},
 		{Hex: "between", Lat: 40.5, Lon: -75.5},
 		{Hex: "nopos"},
 	}}
-	near := r.Filter(Any(WithinNMOf(40, -75, 5), WithinNMOf(41, -76, 5)))
+	near := r.Filter(Or(WithinNMOf(40, -75, 5), WithinNMOf(41, -76, 5)))
 	got := map[string]bool{}
 	for _, a := range near {
 		got[a.Hex] = true
 	}
 	if !got["nearA"] || !got["nearB"] || got["between"] || got["nopos"] || len(got) != 2 {
-		t.Errorf("Any(WithinNMOf...) OR mismatch, matched: %v", got)
+		t.Errorf("Or(WithinNMOf...) mismatch, matched: %v", got)
+	}
+}
+
+func TestAnd(t *testing.T) {
+	// And matches only aircraft passing every filter; here position AND in-circle.
+	r := &AircraftReport{Aircraft: []Aircraft{
+		{Hex: "in", Lat: 40.01, Lon: -75.0},
+		{Hex: "out", Lat: 50.0, Lon: -75.0},
+		{Hex: "nopos"},
+	}}
+	near := r.Filter(And(WithPosition(), WithinNMOf(40, -75, 5)))
+	if len(near) != 1 || near[0].Hex != "in" {
+		t.Errorf("And mismatch, matched: %+v", near)
 	}
 }