2. In case the entire business of any corporation, other
than a corporation engaged in doing business as a regulated
investment company as defined by the Internal Revenue Code of
1986, is not transacted within this Commonwealth, the tax
imposed by this article shall be based upon such portion of the
taxable income of such corporation for the fiscal or calendar
year, as defined in subclause 1 hereof, and may be determined as
follows:
* * *
(b) Railroad, Truck, Bus [or], Airline or Qualified Air
Freight Forwarding Companies.
(1) All business income of railroad, truck, bus [or],
airline and qualified air freight forwarding companies shall be
apportioned to this Commonwealth by multiplying the income by a
fraction, the numerator of which is the taxpayer's total revenue
miles within this Commonwealth during the tax period and the
denominator of which is the total revenue miles of the taxpayer
everywhere during the tax period. For purposes of this paragraph
revenue mile shall mean the average receipts derived from the
transportation by the taxpayer of persons or property one mile.
Where revenue miles are derived from the transportation of both
persons and property, the revenue mile fractions attributable to
each such class of transportation shall be computed separately,
and the average of the two fractions, weighted in accordance
with the ratio of total receipts from each such class of
transportation everywhere to total receipts from both such
classes of transportation everywhere, shall be used in
apportioning income to this Commonwealth.
(2) Nonbusiness income of railroad, truck, bus [or], airline
and qualified air freight forwarding companies shall be
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