Abstract: A passenger ticket, lodging, or other physical space availability may be monitored by obtaining an itinerary record or other dataset associated with a previous space allocation (a previously-booked itinerary or similar purchase, e.g.). This may include, for example, identifying a group of travel segments that corresponds to a ticket or other allocation, “fingerprinting” the allocation, and determining a schedule to periodically monitor terms associated with the allocation. During an availability-monitoring period, an up-to-date version of the itinerary record may be obtained and “fingerprinted,” for example, such fingerprints being usable to determine whether substitutions (identifying more preferable lodging or travel spaces, e.g.) have changed significantly or have already been discovered and implemented, and to take appropriate action (implementing a substitution or updating the itinerary record, e.g.) if so.

Abstract: A passenger ticket, lodging, or other physical space availability may be monitored by obtaining an itinerary record or other dataset associated with a previous space allocation (a previously-booked itinerary or similar purchase, e.g.). This may include, for example, identifying a group of travel segments that corresponds to a ticket or other allocation, “fingerprinting” the allocation, and determining a schedule to periodically monitor terms associated with the allocation. During an availability-monitoring period, an up-to-date version of the itinerary record may be obtained and “fingerprinted,” for example, such fingerprints being usable to determine whether substitutions (identifying more preferable lodging or travel spaces, e.g.) have changed significantly or have already been discovered and implemented, and to take appropriate action (implementing a substitution or updating the itinerary record, e.g.) if so.