Yes, you can reserve two seats for yourself on most airlines, a practice often referred to as booking an "extra comfort" or "personal space" seat. People do this for several reasons: to accommodate a larger physical frame, to protect fragile musical instruments (like a cello), or simply to ensure they have an empty middle seat for privacy and social distancing. To do this correctly, you usually cannot just buy two separate tickets under your name online, as the airline's "duplicate booking" software might automatically cancel one. Instead, you should call the airline's reservations line. They will typically book the second seat with a specific suffix, such as "EXST" (Extra Seat), to ensure the system knows both seats belong to one passenger. While you will have to pay the full fare and taxes for both seats, you generally only have to pay the "security fee" once. A major benefit is that you are often entitled to the baggage allowance for both seats, though this varies by airline. Note that if the flight is overbooked, some airlines have controversial policies about "reclaiming" unused seats, so having the "EXST" designation on your boarding pass is crucial for protection.