Professionals use +4 dBU & the rest uses -10dBV. It is equipment dependent and most professional equipment will have a setting to go either way.
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One billion plus one is one billion and one, normally written as 1,000,000,001.
91 is the dialling code for India. So you would add plus 91 (normally not plus plus 91) to dial a mobile with an Indian number. The phone need not be in India.
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If it is an airline requiring 63" in total dimensions, they are normally referring to length, plus width, plus how tall (or "thick") it is when you finally get it zipped up! :-)