  As a result of intense solar activity during the first ten days of September,
a ground level enhancement occurred on September 10, 2017. Here we computed the
effective dose rates in the polar region at several altitudes during the event
using the derived rigidity spectra of the energetic solar protons. The
contribution of different populations of energetic particles viz. galactic
cosmic rays and solar protons, to the exposure is explicitly considered and
compared. We also assessed the exposure of a crew members/passengers to
radiation at different locations and at several cruise flight altitudes and
calculated the received doses for two typical intercontinental flights. The
estimated received dose during a high-latitude, 40 kft, $\sim$ 10 h flight is
$\sim$ 100 $\mu$Sv.
