Yes it is.
Yes!
No. When counting days for Priority Mail, USPS only includes business days.
The SCAC code for USPS Priority Mail is "USPS." SCAC stands for Standard Carrier Alpha Code, which is used to identify transportation companies in the U.S. The USPS, or United States Postal Service, is the federal postal service that provides various mailing services, including Priority Mail.
USPS Priority Mail is when your package or letter is delivered within 48 hours. USPS will pick the package up at your house for free and you'll be given a tracking number.
It can take anywhere from a couple of days to several weeks. There are no guarantee's on priority mail during the holiday (USPS). The only guaranteed mail delivery is USPS Express Mail.
Visit usps.com to find a local post office near you. Bring the package you wish to mail and they can answer all your questions there about prices and shipping times.
Priority 1 mail through USPS.
Priority mail takes 2 - 3 days within the US.
Pretty much
First-Class Priority mail from USPS is two days
about 5 to 7 days
They deliver to residential zones on Saturday only.