Mach-X 1.5.1 release notes

New

Escort Fighters replace Parachute & Cable: Spitfire escorts circle you, ram and strafe enemies, and the evolution Big Wing adds a faster, wider wing with piercing 20 mm.
Tracer Rounds are reworked into MK I-III: every 5th, 4th or 3rd Ballistic round (from you and your helpers) is a glowing tracer with +60% damage and a chance to ignite.
Heli Napalm Firewall is reworked: flamethrower helicopters spray flame onto a ring that rides with your plane, MK III keeps the ring permanent, and the new Ring of Fire synergy reflects enemy rounds.
The airdrop is now a C-47 Skytrain with invasion stripes that kicks the crate out of the door; the chute blossoms, a flare marks the drop spot, and the chute collapses on landing.
The armoured train rides real track: seeded per-biome rail lines with ballast, sleepers and trestles over water. A 5 or 7-car BP-42 style train rolls in from off the map, its turrets track and fire, and burnt-out cars stay coupled.

Parafrag Bombs are now Frag Cluster and Long Aerial Mines are now Bomblet Stream, so no parachute attacks are left.
Tank bosses (Skyline Tyrant, the Thresher, Flak Tank) drive on the ground: the hull turns to travel, stops at water, leaves tread marks and dust, and steers around buildings. The Ratte flattens trees.
The fuel depot and all ground fixtures are immovable by knockback and pull.
Boss fights are much lighter: the map, your plane and bullets are readable, and white expanding rings are removed.

The boot intro blows the skyline apart with the pressure front, adds a Wilson cloud and a stronger flash, and the title slams in last. It fits landscape screens.
The tornado grows from a thin dust devil into a wide dark funnel, tears out trees and scars the ground; over water it becomes a waterspout.
Ground flak is redrawn as dug-in 2 cm Flakvierling pits, with the guns climbing as the plane closes.
The hangar Lightning (P-38) and Gemini (P-82) models are redrawn.

Start screen: a lamp-lit logo plate, a bigger TAKE OFF button with the plane name, and the button no longer covers the dossier in portrait.
The header fits on one row on landscape phones.