Regularize “a” vs “an” to match English phonetics

[kurahaupo]

In most dialects of English the rule to choose a vs an is to listen to the first sound of the following word (as it is spoken): a before a consonant sound, including h and y, and an before a vowel sound.

Initialisms are read as the names of the letters, and it is important to note that the names of some consonants start with a vowel sound, while the names of some vowels start with a consonant sound:

Initial	Read as
F	an eff
H	an aitch *
L	an ell
M	an em
N	an en
R	an are
S	an ess
U	a you
Y	a why

• some dialects prefer a haitch, especially in Australia

[kurahaupo]

I've been told that some people pronounce “SQL” as “sequel”, but I've never heard it spoken as anything other than “ess cue ell” or (very occasionally) “structured query language”.