  Despite their relatively high intrinsic brightness and the fact that they are
more numerous than younger OB stars and kinematically colder than older red
giants, A-type stars have rarely been used as Galactic tracers. They may, in
fact, be used to fill the age gap between these two tracers, thereby allowing
us to study the transition between them.
  We analyse Galactic disc structure and kinematic perturbations up to 6 kpc
from the Sun based on observations of A-type stars.
  This work presents a catalogue of A-type stars selected using the IGAPS
photometric survey. It covers the Galactic disc within $30^{o}\leq
l\leq215^{o}$ and $|b|\leq5^{o}$ up to a magnitude of $r\leq19$ mag with about
3.5 million sources. We used Gaia Data Release 3 parallaxes and proper motions,
as well as the line-of-sight velocities, to analyse the large-scale features of
the Galactic disc. We carried out a study of the completeness of the detected
density distributions, along with a comparison between the $b<0^{o}$ and
$b>0^{o}$ regions. Possible biases caused by interstellar extinction or by the
usage of some kinematic approximations were examined as well.
  We find stellar overdensities associated with the Local and the Perseus
spiral arms, as well as with the Cygnus region. A-type stars also provide
kinematic indications of the Galactic warp towards the anticentre, which
displays a median vertical motion of ~6-7 km/s at a Galactocentric radius of
R=14 kpc. It starts at R=12 kpc, which supports the scenario where the warp
begins at larger radii for younger tracers when compared with other samples in
the literature. We also detect a region with downward mean motion extending
beyond 2 kpc from the Sun towards $60^{o}<l<75^{o}$ that may be associated with
a compression breathing mode. Furthermore, A-type stars reveal very clumpy
inhomogeneities and asymmetries in the $V_Z$-$V_{\phi}$ velocity space plane.
