The mainland areas where JET2 operate flights are OK too and have a low incidence of infections, lower than in England. Spain isn't the size of a postage stamp but near on twice the size of the UK, so passengers to Malaga, Almeria and Alicante are most unlikely to visit Barcelona or the north west of Spain, as it is simply too far, where there have been outbreaks, which are now under control. JET2 are giving passengers booked to the mainland the option to cancel or delay their holiday and thus cover their backs by allowing the passenger the final decision. This is far better than cancelling all flights until early August awaiting further last minute decisions from the UK Government and causing unnecessary disruption to passengers' travel plans and upheaval of the flight programmes.
The Share Market's reaction will be short lived, as it has reacted to the Government announcement. JET2's decision to maintain all their Spanish destination flights could be described as an advantageous marketing process that will draw passengers away from their competition.