Explain the 21th century practice of airline ticketing and reservation

Reservation and ticket agents are employed by airlines, bus companies, railroads, and cruise lines to help customers in several ways. ... They determine whether seating is available, answer customer inquiries, check baggage, and direct passengers to proper places for boarding.

Explanation:

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the crusades are one of the most significant events in the history of europe and the middle east.   they were a series of religious wars carried out by christian crusaders from europe during the timeframe of the middle ages.   beginning in 1095 ce, the crusades saw european knights and noblemen travel to the middle east in an attempt to capture the holy land away from muslim people that had controlled the region for the previous centuries.   the term crusade means ‘cross’.   therefore, the europeans that became crusaders viewed themselves as ‘taking up the cross’.   in fact, many of the crusaders wore crosses on their clothing and armor as they made their pilgrimage to the holy land.

explanation:

what the first or next guy says