Sorry, but daniellam is wrong on this one.

How to determine if HIPs apply is simply a matter of determining the fare type: all excursion fares should have routings/MPM/stopovers as defined by the fare rules. Tickets designated as unrestricted in the fare type section (e.g. IATA -YY fares) which will show 'Unlimited Permitted' in the stopover field, and will then be subjected to HIP. It's important to remember that many so called excursion fares state unlimited stopovers are allowed, and this is to be taken at face value - HIPs won't be applied; also bear in mind that some unrestricted fares may still be carrier specific for inter IATA-Area travel (e.g. CMB-LAX OZ fares).

HTH

Alex