  We present the exact solution for the scattering problem in the flat space
Jackiw-Teitelboim (JT) gravity coupled to an arbitrary quantum field theory. JT
gravity results in a gravitational dressing of field theoretical scattering
amplitudes. The exact expression for the dressed $S$-matrix was previously
known as a solvable example of a novel UV asymptotic behavior, dubbed
asymptotic fragility. This dressing is equivalent to the $T\bar{T}$ deformation
of the initial quantum field theory. JT gravity coupled to a single massless
boson provides a promising action formulation for an integrable approximation
to the worldsheet theory of confining strings in 3D gluodynamics. We also
derive the dressed $S$-matrix as a flat space limit of the near $AdS_2$
holography. We show that in order to preserve the flat space unitarity the
conventional Schwarzian dressing of boundary correlators needs to be slightly
extended. Finally, we propose a new simple expression for flat space amplitudes
of massive particles in terms of correlators of holographic CFT's.
