Some airlines may skip some letters because some of the letters are absent from their alphabet (e.g. an airline in Vietnam may have the layout ABC-DEG-HKL in economy class because letters f, j, w, and z are absent from the Vietnamese alphabet).
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A and F are window seats. B and E are middle seats. C and D are aisle seats.
We used to skip 33 on certain maps to make the [final] row standardized, but the end row is no longer standardized, a United Airlines spokesperson told Travel + Leisure. In short, the reasoning behind having a unanimous seating map is a math equation of sorts.
“Rows 13 and 17 are missing because these are considered unlucky numbers #bettersafethansorry,” Lufthansa said in a 2017 tweet, accompanied by a wink emoji. United Airlines doesn't have a row 13 or 14 either, with row 14 considered unlucky as it sounds like “will die” in Chinese.
Since there is no middle seats to left of the left aisle and to the right of the right aisle, the letter B is skipped (and K is skipped for the right-hand seats). If this numbering method is used it reduces confusion as A is always windows, C is always aisle etc.
The letter B is used on all aircraft with 6-abreast seating, at least every one I've been on. The reason for B not being used on aircraft with less than 6-across has already been explained, i.e.for consistency between window and aisle seat designators on different types. This is a very common practice.
To book an extra seat, select 2 seats when booking. The first seat you can book for yourself and fill out the fields like your normally would. Airlines can't have 2 seats assigned to the same person, so for the extra seat you will have to make the airline aware it is an extra seat.
“27” requires a heading of 270 degrees (due west, as it turns out). If there are two parallel runways, they become left and right (or “L” and “R”). “27R” is the rightmost of two runways which both require an approach at 270 degrees.
Runway numbers are determined by rounding the compass bearing of one runway end to the nearest 10 degrees and truncating the last digit, meaning runways are numbered from 1 to 36—as per the diagram below. The opposite end of the runway always differs by 180 degrees, so it's numbered 18 higher or lower.