In reply to Babika: Yes, 24 hours on call. If necessary stay at the hospital overnight with injured pupils (Italian law), students carrying walkie-talkies through airports (watched students being led away, later released) etc. Deal with parents and headteacher because pupils have fallen out and injured each other; pupil gets kicked out of ski school because of poor behaviour (endangering whole group and refusing to follow instructions - you'll recall the court case which ran and ran regarding a VI Former who ignored the teachers and was paralysed?) Other health and safety issues (access to alcohol in France at age 15), general welfare calls (eating, drinking sufficient water, suncreams...), teachers skiing with the groups. The LA I worked in had suffered fatalities on ski trips and, following reviews, sought to do everything to the highest standards.
earldonwhu is spot on - it's doing the job properly to bring people's children back as safely as possible from an enjoyable experience. Being shattered in a classroom and maintaining the same high expectations as my colleagues is difficult - I also recognise the lack of awareness from senior management.
Yes, I attended ski trips as a pupil and there is a world of difference from then and now (especially in the legal interpretations, case histories and parental expectations).