Playbooks

Not in any team playbook.
Boomerang Y Cross is a Shotgun trips-weak passing concept built around a deep Y crosser that stretches the field horizontally against man and zone alike. Pre-snap motion brings the boundary receiver into the backfield or across the formation, and at the snap the two trips receivers push vertical up the numbers (one runs a deep comeback breaking away from the play, the other clears out to the corner) while the tight end runs the shallow drag toward the far sideline. The motion man releases underneath into a flat route, and the backfield player checks release protection before working the underneath flat as a checkdown, giving the quarterback a clean progression from the deep crosser to the flat routes if the middle of the field is clogged.
Watch the strong safety pre-snap. If he shifts over the trips side before the snap you are likely seeing a rotation to a two-high shell that will bracket the deep comeback route. Key the middle linebacker at the snap. If he sprints hard toward the crosser's stem immediately you are facing man coverage or a spy, so target the flat routes underneath instead. Identify Cover 3 or Cover 4 shells by checking corner depth before the snap. Deep zone corners sitting off the line signal soft zone that the deep comeback and vertical routes can exploit. User-controlled defenders lurking in the shallow middle zone are the biggest threat to the Y crosser, so if you see a defender sitting in that window, work the checkdown or backside comeback instead. A disguised blitz with a linebacker crashing off the edge pre-snap usually means one-on-one coverage on the crosser, which is a green light to trust that route.
Use the pre-snap motion to identify man versus zone: if the defender follows the motion man across the formation you are getting man coverage and the Y crosser will win versus most linebackers and safeties in trail technique.
This play works best on second and medium to third and medium since the Y crosser needs time to develop and the underneath flats give you safe outlets against a hard pass rush.
Pair this call with Bounce Slot Cross or Dig Cross from the same set so the defense sees similar route stems and motion but different breakpoints, forcing linebackers to hesitate on their crosser drops.
Hot route the backside vertical route into a hitch or comeback if you see a single high safety rotating late, since the deep comeback naturally beats a soft corner cushion.
Against zone drops, throw the flat route quickly off the motion man before the underneath linebacker can sink and wall off the crosser.