  CONTEXT.The first Gaia Data Release (DR1) significantly improved the
previously available proper motions for the majority of the Tycho-2 stars.
AIMS. We want to detect runaway stars using Gaia DR1 proper motions and compare
our results with previous searches. METHODS. Runaway O stars and BA supergiants
are detected using a 2-D proper-motion method. The sample is selected using
Simbad, spectra from our GOSSS project, literature spectral types, and
photometry processed using CHORIZOS. RESULTS. We detect 76 runaway stars, 17
(possibly 19) of them with no prior identification as such, with an estimated
detection rate of approximately one half of the real runaway fraction. An age
effect appears to be present, with objects of spectral subtype B1 and later
having travelled for longer distances than runaways of earlier subtypes. We
also tentatively propose that the fraction of runaways is lower among BA
supergiants that among O stars but further studies using future Gaia data
releases are needed to confirm this. The frequency of fast rotators is high
among runaway O stars, which indicates that a significant fraction of them (and
possibly a majority) is produced in supernova explosions.
