A sustainable transportation system is the one that is designed based on environmental awareness, social equity, and economic opportunities. Public transportation, in general, and intercity transit, in particular, are playing very significant roles for communities to reach their sustainability goals. Of the available intercity transit services, buses are showing a noteworthy growth to be a competitive mode in terms of sustainability indicators. After several decades of decline, intercity bus services are growing at an increasing rate, overtaking other intercity services. This paper, based on data from various sources and existing literature, makes a comparative analysis of intercity bus services with its competitors, mainly train transit (Amtrak) and air services. The analysis result shows that intercity buses are standing out to be an environmentally-friendly, economically-viable, and socially-inclusive mode of long-distance travel (especially to rural and small communities and for persons with no car).