First-class long-haul fares regularly[citation needed] exceed $10,000[which?] per person round trip, as opposed to $4,000–5,000 international business class tickets and $300–2,000 economy class tickets. With the emergence of frequent-flyer programmes, however, passengers have been able to upgrade their business- or economy-class tickets through membership in elite frequent-flyer programs and through the policies of some airlines that allow business and economy-class passengers to purchase last-minute upgrades on a space-available basis. Some airlines also offer upgrading to first class as a bonus to their employees.