Date of birth is not a factor that determines upgrade eligibility. Frequent flyer status, ticket fare class, and credit card status are all factors that can affect upgrade eligibility.

Complimentary upgrades are the most common type of upgrade. They are typically offered to frequent flyers or passengers who have purchased a higher fare class ticket.

Email is not a method for requesting an upgrade. Upgrades can be requested online, at the airport check-in counter, or by phone.

There is no deadline for requesting an upgrade. However, it is best to request an upgrade as early as possible to increase your chances of getting one.

The airline will typically send you an email confirmation if your upgrade is confirmed. You may also be notified at the airport check-in counter or on the plane.

If your upgrade is not confirmed, you will be placed on a waitlist. If a seat in the upgraded class becomes available, you will be notified and your upgrade will be confirmed.

Upgrading to a higher fare class typically comes with a number of benefits, including more legroom, wider seats, free checked bags, and priority boarding.

Upgrading to a higher fare class typically comes with a number of risks, including higher cost, less flexibility, and the potential for downgrade.

There are a number of things you can do to increase your chances of getting an upgrade, including being a frequent flyer, purchasing a higher fare class ticket, and having a good credit score.

If you are denied an upgrade, it is important to be polite and understanding. You can also ask to speak to a supervisor or file a complaint with the airline.

Complimentary upgrades are free, while paid upgrades cost money. Complimentary upgrades are only available to frequent flyers, while paid upgrades are available to anyone. Complimentary upgrades are typically confirmed at the time of booking, while paid upgrades are typically confirmed at the airport.

Operational upgrades are given to passengers who are inconvenienced by a flight delay or cancellation, while status upgrades are given to frequent flyers. Operational upgrades are typically confirmed at the airport, while status upgrades are typically confirmed at the time of booking. Operational upgrades are free, while status upgrades cost money.

There are a number of ways to find out about upgrade availability, including checking the airline's website, calling the airline's customer service number, and asking at the airport check-in counter.

There are a number of things you can do to prepare for an upgrade, including arriving at the airport early, dressing professionally, and being polite and friendly to the airline staff.