On a clear day, a pilot in controlled airspace can choose a VFR or IFR flightplan, and the FAA regulations were devised in a way which accommodates both VFR and IFR operations in the same airspace.
The plane's flightplan indicated it was headed next to Sri Lanka, possibly to refuel en route to another destination.
飞机的飞行计划显示,下一站将是斯里兰卡,或许是要在飞往另外一个目的地的途中在那里加油。
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Owners of larger jet planes, for example, need only submit their flightplan 24 hours in advance - as opposed to weeks in advance for smaller craft like single-engine planes.