Surprisingly, it's not necessarily spotters who call up. It could be anyone, from airport staff, police/fire/ambulance people who usually have good contacts with the press
Well as one of the 'ambulance people' I not sure I d risk my job to call the press... the services I ve worked for expressly forbid speaking with the press.
Emergency services' managers will/do spend an incredible amount of time looking for evidence to stitch up their staff.
Oh yes I do have one press contact - but she works for a weekly free paper! Not sure that there are many of us that have a hotline to The Sun...
PW